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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator [Abstract]                      
Net Income from continuing operations $ 32,289 $ 20,388 $ (2,042) $ 11,889 $ 42,491 $ 42,088 $ 22,565 $ (15,728) $ 62,524 $ 91,416 $ 54,266
Interest expense, net of tax                 3,255 3,019 2,879
Amortization of debt issuance costs, net of tax                 781 868 735
Net income, adjusted from continuing operations                 66,560 95,303 57,880
Income (loss) from discontinued operations $ 5,103 $ 952 $ (8,905) $ (7,898) $ (9,144) $ (5,145) $ (8,465) $ (5,792) (10,748) (28,546) (17,525)
Net income (loss), adjusted                 $ 55,812 $ 66,757 $ 40,355
Denominator [Abstract]                      
Weighted-average number of shares-basic (in shares)                 40,184,159 38,595,435 37,344,891
Dilutive securities-equity awards (in shares)                 1,054,453 939,882 737,391
Dilutive securities-convertible debt                 8,096,500 7,720,525 7,720,525
Weighted-average number of shares-diluted (in shares)                 49,335,112 47,255,842 45,802,807
Net income per share - basic from continuing operations (in dollars per share) $ 0.80 $ 0.50 $ (0.05) $ 0.30 $ 1.08 $ 1.08 $ 0.59 $ (0.42) $ 1.56 $ 2.37 $ 1.45
Net loss from discontinued operations-basic 0.13 0.02 (0.22) (0.20) (0.23) (0.14) (0.22) (0.15) (0.27) (0.74) (0.47)
Net income per share - basic (in dollars per share) 0.93 0.52 (0.27) 0.10 0.85 0.94 0.37 (0.57) 1.29 1.63 0.98
Net income per share - diluted from continuing operations (in dollars per share) 0.67 0.43 (0.05) 0.26 0.90 0.90 0.50 (0.42) 1.35 2.02 1.26
Net loss per share from discontinued operations-basic 0.10 0.02 (0.22) (0.16) (0.19) (0.11) (0.18) (0.15) (0.22) (0.61) (0.38)
Net income per share-diluted $ 0.77 $ 0.45 $ (0.27) $ 0.10 $ 0.71 $ 0.79 $ 0.32 $ (0.57) $ 1.13 $ 1.41 $ 0.88
Stock Options [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive shares excluded from calculation (in shares)                     1,400,000