Annual report pursuant to Section 13 and 15(d)

Quarterly Results (Unaudited) (Details)

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Quarterly Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Apr. 30, 2010
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Mar. 31, 2012
Quarterly Results [Line Items]                      
Revenues $ 13,183 $ 71,667 $ 76,830 $ 67,849 $ 67,690 $ 69,568 $ 69,280 $ 68,399 $ 65,076 $ 227,880 $ 272,323
Gross Profit 6,616 31,903 34,951 32,639 33,339 34,484 33,691 31,951 31,989 95,485 132,115
Operating income (loss)   11,858 15,253 15,347 14,530 15,000 15,582 14,386 (512)    
Net income (loss)   5,649 7,738 6,987 6,600 6,250 [1] 6,933 [1] 3,814 [1] (4,966) [1]    
Earnings Per Share, Basic and Diluted [Abstract]                      
Basic (in dollars per share)   $ 0.18 $ 0.25 $ 0.23 $ 0.22 $ 0.21 $ 0.23 $ 0.13 $ (0.18)    
Earnings Per Share, Basic and Diluted   $ 0.18 $ 0.24 $ 0.22 $ 0.21 $ 0.20 $ 0.22 $ 0.12 $ (0.18)    
Private Equity Sponsors [Member] | IPO [Member]
                     
Quarterly Results [Line Items]                      
Stock compensation expense associated with the acceleration of the pre-IPO options                 6,341    
Earnings Per Share, Basic and Diluted [Abstract]                      
Fees for the termination of management agreements                 $ 8,105    
[1] During the three months ended June 30, 2011, we completed our IPO. Expenses related to the IPO included $6,341 in stock compensation for the accelerated vesting of options and $8,105 as a management termination fee to our former private equity sponsors.