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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

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