Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at balance sheet date			$ 1,824	$ 917
Other comprehensive (loss) income before reclassifications			(890)	4,094
Amounts reclassified from accumulated other comprehensive loss			(4,779)	(3,500)
Total changes in other comprehensive loss	$ (455)	$ 3,218	(5,669)	594
Balance at balance sheet date	(3,845)	1,511	(3,845)	1,511
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at balance sheet date			(2,080)	(971)
Other comprehensive (loss) income before reclassifications			(7,709)	(164)
Amounts reclassified from accumulated other comprehensive loss			0	0
Total changes in other comprehensive loss			(7,709)	(164)
Balance at balance sheet date	(9,789)	(1,135)	(9,789)	(1,135)
Unrealized Holding Gains on Marketable Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at balance sheet date			126	(123)
Other comprehensive (loss) income before reclassifications			104	186
Amounts reclassified from accumulated other comprehensive loss			0	0
Total changes in other comprehensive loss			104	186
Balance at balance sheet date	230	63	230	63
Unrealized Gains (Losses) on Foreign Currency Forward Contracts, net of tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at balance sheet date			3,778	2,011
Other comprehensive (loss) income before reclassifications			6,715	4,072
Amounts reclassified from accumulated other comprehensive loss			(4,779)	(3,500)
Total changes in other comprehensive loss			1,936	572
Balance at balance sheet date	$ 5,714	$ 2,583	$ 5,714	$ 2,583