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Consolidated Statement of Shareholders' Equity Statement - USD ($) $ in Thousands | Total | Common Stock [Member] | Paid-in Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income [Member]
--- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 |  |  |  |  | $ (24,400)
Net income | $ 34,970 |  |  |  |
Other comprehensive loss | 7,660 |  |  |  | 7,660
Shares surrendered upon exercise and vesting of equity awards to cover taxes | (480) |  |  |  |
Balances at Sep. 30, 2017 |  |  |  |  | (16,740)
Balances at Dec. 31, 2017 | 544,020 | $ 460 | $ 823,850 | $ (262,960) | (17,330)
Net income | 66,590 |  |  | 66,590 |
Other comprehensive loss | (1,550) |  |  |  | (1,550)
Purchase of common stock | (3,590) |  | (3,590) |  |
Shares surrendered upon exercise and vesting of equity awards to cover taxes | (2,380) |  | (2,380) |  |
Non-cash compensation expense | 4,400 |  | 4,400 |  |
Balances at Sep. 30, 2018 | $ 607,490 | $ 460 | $ 822,280 | $ (196,370) | $ (18,880)

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