Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 731,774	$ 920,091	$ 892,161
Other comprehensive income before reclassifications	213	1,445	7,180
Amounts reclassified from accumulated other comprehensive income	(9,665)
Other comprehensive (loss) income	(9,452)	1,445	7,180
Balance	651,983	731,774	920,091
Total [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	3,973	2,528	(4,652)
Balance	(5,479)	3,973	2,528
Foreign currency translation adjustment [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	3,924	2,479	(4,701)
Other comprehensive income before reclassifications	213	1,445	7,180
Amounts reclassified from accumulated other comprehensive income	(9,616)
Other comprehensive (loss) income	(9,403)	1,445	7,180
Balance	(5,479)	3,924	2,479
Unrealized (gain) loss on available for sale securities [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	49	49	49
Other comprehensive income before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive income	(49)
Other comprehensive (loss) income	(49)	0	0
Balance	$ 0	$ 49	$ 49