Consolidated Statement of Shareholders' Equity Statement - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balances at Dec. 31, 2016	$ 499,720	$ 460	$ 817,580	$ (293,920)	$ (24,400)
Net income	34,970			34,970
Other comprehensive income	7,660				7,660
Shares surrendered upon options and restricted stock vesting to cover taxes	(480)		(480)
Non-cash compensation expense	5,090		5,090
Balances at Sep. 30, 2017	$ 546,960	$ 460	$ 822,190	$ (258,950)	$ (16,740)