Annual report pursuant to Section 13 and 15(d)

Quarterly Results (Unaudited) (Details)

v2.4.0.8
Quarterly Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Quarterly Results [Line Items]                      
Revenues $ 67,475 $ 71,465 $ 72,783 $ 65,600              
Revenues         71,667 76,830 67,849 67,690 277,323 284,036 272,323
Gross Profit 32,745 36,056 35,355 31,014 31,903 34,951 32,639 33,339 135,170 132,832 132,115
Operating income (loss) 14,351 17,758 14,453 12,055 11,858 15,253 15,347 14,530 58,617 56,988 44,456
Net income (loss) $ 9,582 $ 12,583 $ 10,572 $ (6,938) $ 5,649 $ 7,738 $ 6,987 $ 6,600   $ 26,974 $ 12,030
Earnings Per Share, Basic and Diluted [Abstract]                      
Basic (in dollars per share) $ 0.30 $ 0.40 $ 0.34 $ (0.22) $ 0.18 $ 0.25 $ 0.23 $ 0.22 $ 0.82 $ 0.88 $ 0.41
Earnings Per Share, Basic and Diluted         $ 0.18 $ 0.24 $ 0.22        
Earnings Per Share, Diluted $ 0.30 $ 0.39 $ 0.33 $ (0.22)         $ 0.80 [1] $ 0.85 [1] $ 0.40 [1]
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