CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - 9 months ended Sep. 30, 2018 - 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 income and comprehensive income	99,799			99,799		$ 99,799
Non-cash compensation	$ 34,384		34,384
Purchase of treasury stock (in shares)	205,310				205,000
Purchase of treasury stock	$ (57,183)				$ (57,183)
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes	3,236	$ 12	3,224
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares)		1,172,000
Cumulative effect adjustment due to ASU 2014-09	1,373			1,373
Issuance of 0.625% Convertible Senior Notes, net	5		5
Noncontrolling interest	(12)						(12)
Balance at Sep. 30, 2018	$ 376,466	$ 154	$ 1,125,185	$ (607,182)	$ (142,268)		$ 577
Balance (in shares) at Sep. 30, 2018		15,390,000			2,444,000