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Stock-Based Compensation Expense (Details) (USD $)
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3 Months Ended | 6 Months Ended | 49 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Jun. 30, 2014
plan
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Jul. 28, 2010
Restricted Stock and Stock Option Plan
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Apr. 08, 2011
2011 Long-term Incentive Plan
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Sep. 30, 2014
Restricted Stock Units
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Sep. 30, 2014
Restricted Stock Units
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Sep. 30, 2014
Common Stock [Member]
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Sep. 30, 2014
Common Stock [Member]
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Sep. 30, 2014
Performance Shares [Member]
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Sep. 30, 2014
Performance Shares [Member]
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Sep. 30, 2014
Minimum
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Sep. 30, 2014
Minimum
Performance Shares [Member]
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Sep. 30, 2014
Maximum
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Sep. 30, 2014
Maximum
Performance Shares [Member]
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| Stock-Based Compensation Expense | |||||||||||||||||
| Number of stock option award plans | 2 | ||||||||||||||||
| Maximum number of shares of the company's common stock that may be awarded | 2,767,171 | 2,893,341 | |||||||||||||||
| Options outstanding (in shares) | 478,708 | 478,708 | |||||||||||||||
| Stock compensation expense | $ 816,000 | $ 544,000 | $ 1,372,000 | $ 910,000 | |||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 93,562 | 3,948 | 46,530 | ||||||||||||||
| Share Price | $ 24.38 | $ 25.89 | |||||||||||||||
| Stock Issued During Period, Value, Restricted Stock Award, Gross | $ 2,289,000 | $ 96,000 | $ 385,000 | $ 1,142,000 | |||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | ||||||||||||||||
| Share-based compensation arrangement by share-based payment award, award requisite service period (in years) | 2 years | 3 years | |||||||||||||||
| Possible number of shares that could be issued (in shares) | 0 | 93,060 | |||||||||||||||