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UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Earnings
--- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Cumulative effect of change in accounting principle | $ (1,564) |  |  |  | $ (1,564)
Balance beginning of period at Dec. 31, 2017 | 1,188,202 | $ 565 | $ 686,962 | $ (172,407) | 673,082
Balance beginning of period (in shares) at Dec. 31, 2017 |  | 56,501 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | (12,631) |  |  |  | (12,631)
Other comprehensive (loss) income | (16,746) |  |  | (16,746) |
Stock-based compensation | 3,077 |  | 3,077 |  |
Issuance of restricted shares, net of shares remitted and tax withholdings | (548) | $ 0 | (548) |  |
Issuance of restricted shares, net of shares remitted and tax withholdings (in shares) |  | 24 |  |  |
Repurchases of common stock | (14,264) | $ (3) | (14,261) |  |
Repurchases of common stock (in shares) |  | (280) |  |  |
Balance ending of period at Mar. 31, 2018 | 1,145,526 | $ 562 | 675,230 | (189,153) | 658,887
Balance ending of period (in shares) at Mar. 31, 2018 |  | 56,245 |  |  |
Balance beginning of period at Dec. 31, 2017 | 1,188,202 | $ 565 | 686,962 | (172,407) | 673,082
Balance beginning of period (in shares) at Dec. 31, 2017 |  | 56,501 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 49,205 |  |  |  |
Other comprehensive (loss) income | (13,098) |  |  |  |
Repurchases of common stock | $ (33,600) |  |  |  |
Repurchases of common stock (in shares) | (600) |  |  |  |
Balance ending of period at Sep. 30, 2018 | $ 1,197,324 | $ 560 | 661,546 | (185,505) | 720,723
Balance ending of period (in shares) at Sep. 30, 2018 |  | 55,998 |  |  |
Balance beginning of period at Mar. 31, 2018 | 1,145,526 | $ 562 | 675,230 | (189,153) | 658,887
Balance beginning of period (in shares) at Mar. 31, 2018 |  | 56,245 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 30,747 |  |  |  | 30,747
Other comprehensive (loss) income | (4,942) |  |  | (4,942) |
Stock-based compensation | 3,562 |  | 3,562 |  |
Issuance of restricted shares, net of shares remitted and tax withholdings | (1,627) | $ 1 | (1,628) |  |
Issuance of restricted shares, net of shares remitted and tax withholdings (in shares) |  | 94 |  |  |
Repurchases of common stock | (12,218) | $ (2) | (12,216) |  |
Repurchases of common stock (in shares) |  | (252) |  |  |
Balance ending of period at Jun. 30, 2018 | 1,161,048 | $ 561 | 664,948 | (194,095) | 689,634
Balance ending of period (in shares) at Jun. 30, 2018 |  | 56,087 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 31,089 |  |  |  | 31,089
Other comprehensive (loss) income | 8,590 |  |  | 8,590 |
Stock-based compensation | 4,087 |  | 4,087 |  |
Issuance of restricted shares, net of shares remitted and tax withholdings | (391) | $ 0 | (391) |  |
Issuance of restricted shares, net of shares remitted and tax withholdings (in shares) |  | 15 |  |  |
Repurchases of common stock | $ (7,099) | $ (1) | (7,098) |  |
Repurchases of common stock (in shares) | (100) | (104) |  |  |
Balance ending of period at Sep. 30, 2018 | $ 1,197,324 | $ 560 | 661,546 | (185,505) | 720,723
Balance ending of period (in shares) at Sep. 30, 2018 |  | 55,998 |  |  |
Balance beginning of period at Dec. 31, 2018 | 1,169,756 | $ 558 | 655,415 | (223,371) | 737,154
Balance beginning of period (in shares) at Dec. 31, 2018 |  | 55,847 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 976 |  |  |  | 976
Other comprehensive (loss) income | 4,024 |  |  | 4,024 |
Stock-based compensation | 5,809 |  | 5,809 |  |
Issuance of restricted shares, net of shares remitted and tax withholdings | (2,276) | $ 1 | (2,277) |  |
Issuance of restricted shares, net of shares remitted and tax withholdings (in shares) |  | 78 |  |  |
Repurchases of common stock | (6,324) | $ (1) | (6,323) |  |
Repurchases of common stock (in shares) |  | (97) |  |  |
Balance ending of period at Mar. 31, 2019 | 1,171,965 | $ 558 | 652,624 | (219,347) | 738,130
Balance ending of period (in shares) at Mar. 31, 2019 |  | 55,828 |  |  |
Balance beginning of period at Dec. 31, 2018 | 1,169,756 | $ 558 | 655,415 | (223,371) | 737,154
Balance beginning of period (in shares) at Dec. 31, 2018 |  | 55,847 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 73,589 |  |  |  |
Other comprehensive (loss) income | (319) |  |  |  |
Repurchases of common stock | $ (16,400) |  |  |  |
Repurchases of common stock (in shares) | (200) |  |  |  |
Balance ending of period at Sep. 30, 2019 | $ 1,235,795 | $ 558 | 648,184 | (223,690) | 810,743
Balance ending of period (in shares) at Sep. 30, 2019 |  | 55,808 |  |  |
Balance beginning of period at Mar. 31, 2019 | 1,171,965 | $ 558 | 652,624 | (219,347) | 738,130
Balance beginning of period (in shares) at Mar. 31, 2019 |  | 55,828 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 36,244 |  |  |  | 36,244
Other comprehensive (loss) income | 5,076 |  |  | 5,076 |
Stock-based compensation | 3,834 |  | 3,834 |  |
Issuance of restricted shares, net of shares remitted and tax withholdings | (2,704) | $ 1 | (2,705) |  |
Issuance of restricted shares, net of shares remitted and tax withholdings (in shares) |  | 105 |  |  |
Repurchases of common stock | (4,948) |  | (4,948) |  |
Repurchases of common stock (in shares) |  | (74) |  |  |
Balance ending of period at Jun. 30, 2019 | 1,209,467 | $ 559 | 648,805 | (214,271) | 774,374
Balance ending of period (in shares) at Jun. 30, 2019 |  | 55,859 |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) | 36,369 |  |  |  | 36,369
Other comprehensive (loss) income | (9,419) |  |  | (9,419) |
Stock-based compensation | 5,021 |  | 5,021 |  |
Issuance of restricted shares, net of shares remitted and tax withholdings | (525) |  | (525) |  |
Issuance of restricted shares, net of shares remitted and tax withholdings (in shares) |  | 17 |  |  |
Repurchases of common stock | $ (5,118) | $ (1) | (5,117) |  |
Repurchases of common stock (in shares) | (100) | (68) |  |  |
Balance ending of period at Sep. 30, 2019 | $ 1,235,795 | $ 558 | $ 648,184 | $ (223,690) | $ 810,743
Balance ending of period (in shares) at Sep. 30, 2019 |  | 55,808 |  |  |

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