Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 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			(3,154)	(20)
Amounts reclassified from accumulated other comprehensive loss			(2,060)	(2,604)
Total changes in other comprehensive loss	$ 1,509	$ (2,498)	(5,214)	(2,624)
Balance at balance sheet date	(3,390)	(1,707)	(3,390)	(1,707)
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			(5,201)	1,220
Amounts reclassified from accumulated other comprehensive loss			0	0
Total changes in other comprehensive loss			(5,201)	1,220
Balance at balance sheet date	(7,281)	249	(7,281)	249
Unrealized Holding Gains (Losses) 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			200	130
Amounts reclassified from accumulated other comprehensive loss			0	0
Total changes in other comprehensive loss			200	130
Balance at balance sheet date	326	7	326	7
Unrealized Gains 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			1,847	(1,370)
Amounts reclassified from accumulated other comprehensive loss			(2,060)	(2,604)
Total changes in other comprehensive loss			(213)	(3,974)
Balance at balance sheet date	$ 3,565	$ (1,963)	$ 3,565	$ (1,963)