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Earnings per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator [Abstract]                      
Net Income from continuing operations $ 33,942 $ 33,551 $ 4,616 $ 10,485 $ 32,289 $ 20,388 $ (2,042) $ 11,889 $ 82,594 $ 62,524 $ 91,416
Interest expense, net of tax                 2,606 3,255 3,019
Amortization of debt issuance costs, net of tax                 681 781 868
Net income, adjusted from continuing operations                 85,881 66,560 95,303
Net loss from discontinued operations         $ 5,103 [1] $ 952 [1] $ (8,905) [1] $ (7,898) [1] 0 (10,748) (28,546)
Net income, adjusted                 $ 85,881 $ 55,812 $ 66,757
Denominator [Abstract]                      
Weighted-average number of shares-basic (in shares)                 41,816,431 40,184,159 38,595,435
Dilutive securities-equity awards (in shares)                 1,115,244 1,054,453 939,882
Dilutive securities-convertible debt (in shares)                 7,396,262 8,096,500 7,720,525
Weighted-average number of shares-diluted (in shares)                 50,327,937 49,335,112 47,255,842
Net income per share from continuing operations-basic (in dollars per share) $ 0.77 $ 0.81 $ 0.11 $ 0.26 $ 0.80 $ 0.50 $ (0.05) $ 0.30 $ 1.98 $ 1.56 $ 2.37
Net loss per share from discontinued operations-basic (in dollars per share)         0.13 0.02 (0.22) (0.20) 0 (0.27) (0.74)
Net income per share-basic (in dollars per share)         0.93 0.52 (0.27) 0.10 1.98 1.29 1.63
Net income per share-diluted from continuing operations (in dollars per share) $ 0.67 $ 0.68 $ 0.11 $ 0.23 0.67 0.43 (0.05) 0.26 1.71 1.35 2.02
Net loss per share-diluted from discontinued operations (in dollars per share)         0.10 0.02 (0.22) (0.16) 0 (0.22) (0.61)
Net income per share-diluted (in dollars per share)         $ 0.77 $ 0.45 $ (0.27) $ 0.10 $ 1.71 [2] $ 1.13 [2] $ 1.41 [2]
Stock Options [Member]                      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                      
Antidilutive shares excluded from calculation (in shares)                     1,400,000
[1] Reflects a change in estimate attributed to higher pretax income within continuing operations. According to the ordering rules of intraperiod tax allocation, the residual amount of change after determining the effective rate for continuing operations is allocated to discontinued operations.
[2] See "Earnings per share" footnote for details on calculation.