Consolidated Statements of Comprehensive Income Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Treasury Stock, Shares, Acquired	0	1,152,386
Net income (loss)	$ 14,290	$ (3,446)
Other comprehensive income, net of tax
Changes in cumulative translation adjustment	9	2
Comprehensive income (loss)	$ 14,299	$ (3,444)