CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (39,873)	$ 44,102	$ (28,328)
Other comprehensive income (loss):
Unrealized (losses) gains on available-for-sale securities (net of taxes of $214, $0 and $183, respectively)	(321)	0	976
Reclassification adjustment for gains on available-for-sale securities included in net income (net of taxes of $0, $0, $508, respectively)	0	0	(2,880)
Foreign currency translation adjustments (including a tax benefit of $16.8 million in 2016)	40,728	(144,050)	(88,725)
Unfunded pension liability (net of taxes of $57, $7 and $248, respectively)	159	0	(657)
Other comprehensive income (loss)	40,566	(144,050)	(91,286)
Comprehensive income (loss)	$ 693	$ (99,948)	$ (119,614)