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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Treasury Stock | Comprehensive Income (Loss) | Noncontrolling interest
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 294,874 | $ 142 | $ 1,087,582 | $ (708,354) | $ (85,085) |  | $ 589
Balance (in shares) at Dec. 31, 2017 |  | 14,218,000 |  |  | 2,239,000 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (loss) income and comprehensive (loss) income |  |  |  | 31,524 |  | $ 31,524 |
Non-cash compensation | 11,109 |  | 11,109 |  |  |  |
Purchase of treasury stock (in shares) |  |  |  |  | 30,000 |  |
Purchase of treasury stock | (11,000) |  |  |  | $ (11,000) |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | 2,057 | $ 5 | 2,052 |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 473,000 |  |  |  |  |
Cumulative effect adjustment due to ASU 2014-09 | 1,373 |  |  | 1,373 |  |  |
Noncontrolling interest | (34) |  |  |  |  |  | (34)
Balance at Mar. 31, 2018 | 329,903 | $ 147 | 1,100,743 | (675,457) | $ (96,085) |  | 555
Balance (in shares) at Mar. 31, 2018 |  | 14,691,000 |  |  | 2,269,000 |  |
Balance at Dec. 31, 2017 | 294,874 | $ 142 | 1,087,582 | (708,354) | $ (85,085) |  | 589
Balance (in shares) at Dec. 31, 2017 |  | 14,218,000 |  |  | 2,239,000 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (loss) income and comprehensive (loss) income | $ 74,071 |  |  |  |  |  |
Purchase of treasury stock (in shares) | 156,731 |  |  |  |  |  |
Purchase of treasury stock | $ (46,000) |  |  |  |  |  |
Balance at Jun. 30, 2018 | 347,428 | $ 151 | 1,110,688 | (632,910) | $ (131,088) |  | 587
Balance (in shares) at Jun. 30, 2018 |  | 15,138,000 |  |  | 2,396,000 |  |
Balance at Mar. 31, 2018 | 329,903 | $ 147 | 1,100,743 | (675,457) | $ (96,085) |  | 555
Balance (in shares) at Mar. 31, 2018 |  | 14,691,000 |  |  | 2,269,000 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (loss) income and comprehensive (loss) income | 42,547 |  |  | 42,547 |  | 42,547 |
Non-cash compensation | 11,178 |  | 11,178 |  |  |  |
Purchase of treasury stock (in shares) |  |  |  |  | 127,000 |  |
Purchase of treasury stock | (35,003) |  |  |  | $ (35,003) |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (1,225) | $ 4 | (1,229) |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 447,000 |  |  |  |  |
Issuance of 0.625% Convertible Senior Notes, net | (4) |  | (4) |  |  |  |
Noncontrolling interest | 32 |  |  |  |  |  | 32
Balance at Jun. 30, 2018 | 347,428 | $ 151 | 1,110,688 | (632,910) | $ (131,088) |  | $ 587
Balance (in shares) at Jun. 30, 2018 |  | 15,138,000 |  |  | 2,396,000 |  |
Balance at Dec. 31, 2018 | 346,208 | $ 154 | 1,134,227 | (610,482) | $ (177,691) |  |
Balance (in shares) at Dec. 31, 2018 |  | 15,428,000 |  |  | 2,618,000 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (loss) income and comprehensive (loss) income |  |  |  | (512) |  | (512) |
Non-cash compensation | (14,053) |  | (14,053) |  |  |  |
Purchase of treasury stock (in shares) |  |  |  |  | 18,000 |  |
Purchase of treasury stock | (3,976) |  |  |  | $ 3,976 |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (3,585) | $ 1 | (3,586) |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 87,000 |  |  |  |  |
Balance at Mar. 31, 2019 | 352,188 | $ 155 | 1,144,694 | (610,994) | $ (181,667) |  |
Balance (in shares) at Mar. 31, 2019 |  | 15,515,000 |  |  | 2,636,000 |  |
Balance at Dec. 31, 2018 | 346,208 | $ 154 | 1,134,227 | (610,482) | $ (177,691) |  |
Balance (in shares) at Dec. 31, 2018 |  | 15,428,000 |  |  | 2,618,000 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (loss) income and comprehensive (loss) income | $ 11,706 |  |  |  |  |  |
Purchase of treasury stock (in shares) | 17,501 |  |  |  |  |  |
Purchase of treasury stock | $ (4,000) |  |  |  |  |  |
Balance at Jun. 30, 2019 | 373,887 | $ 156 | 1,154,174 | (598,776) | $ (181,667) |  |
Balance (in shares) at Jun. 30, 2019 |  | 15,604,000 |  |  | 2,636,000 |  |
Balance at Mar. 31, 2019 | 352,188 | $ 155 | 1,144,694 | (610,994) | $ (181,667) |  |
Balance (in shares) at Mar. 31, 2019 |  | 15,515,000 |  |  | 2,636,000 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |  |
Net (loss) income and comprehensive (loss) income | 12,218 |  |  | 12,218 |  | $ 12,218 |
Non-cash compensation | (15,982) |  | (15,982) |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (6,501) | $ 1 | (6,502) |  |  |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 89,000 |  |  |  |  |
Balance at Jun. 30, 2019 | $ 373,887 | $ 156 | $ 1,154,174 | $ (598,776) | $ (181,667) |  |
Balance (in shares) at Jun. 30, 2019 |  | 15,604,000 |  |  | 2,636,000 |  |

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