Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation Expense (Details)

v3.8.0.1
Stock-Based Compensation Expense (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 49 Months Ended
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Jun. 30, 2014
plan
Apr. 08, 2011
shares
Jul. 28, 2010
shares
Stock-Based Compensation Expense              
Number of stock option award plans | plan         2    
Options outstanding (in shares) 391,598   391,598        
Stock compensation expense | $ $ 895 $ 837 $ 2,627 $ 2,658      
Restricted Stock and Stock Option Plan              
Stock-Based Compensation Expense              
Maximum number of shares of the company's common stock that may be awarded             2,767,171
2011 Long-term Incentive Plan              
Stock-Based Compensation Expense              
Maximum number of shares of the company's common stock that may be awarded           2,893,341  
Restricted Stock Units              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     106,891        
Stock Issued During Period, Value, Restricted Stock Award, Gross | $     $ 1,985        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     3 years        
Common Stock              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 5,782   15,834        
Stock Issued During Period, Value, Restricted Stock Award, Gross | $ $ 105   $ 306        
Share-based compensation arrangement by share-based payment award, fair value of shares authorized amount | $ $ 420   $ 420        
Performance Shares              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     15,438        
Stock Issued During Period, Value, Restricted Stock Award, Gross | $     $ 340        
Minimum              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Possible Number of Performance Shares to be Granted     0        
Maximum              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Possible Number of Performance Shares to be Granted     30,876        
Management | Performance Shares              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     58,246        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value | $     $ 1,080        
Management | Minimum              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Possible Number of Performance Shares to be Granted     0        
Management | Maximum              
Stock-Based Compensation Expense              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Possible Number of Performance Shares to be Granted     116,492