Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at balance sheet date	$ 917	$ (306)
Other comprehensive (loss) income before reclassifications	1,572	6
Amounts reclassified from accumulated other comprehensive loss	(1,698)	3
Total changes in other comprehensive loss	(126)	9
Balance at balance sheet date	791	(297)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at balance sheet date	(971)	(325)
Other comprehensive (loss) income before reclassifications	(608)	72
Amounts reclassified from accumulated other comprehensive loss	0	0
Total changes in other comprehensive loss	(608)	72
Balance at balance sheet date	(1,579)	(253)
Unrealized Holding Gains (Losses) on Marketable Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at balance sheet date	(123)	42
Other comprehensive (loss) income before reclassifications	176	(27)
Amounts reclassified from accumulated other comprehensive loss	0	0
Total changes in other comprehensive loss	176	(27)
Balance at balance sheet date	53	15
Unrealized Gains (Losses) on Foreign Currency Forward Contracts
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at balance sheet date	2,011	(23)
Other comprehensive (loss) income before reclassifications	2,004	(39)
Amounts reclassified from accumulated other comprehensive loss	(1,698)	3
Total changes in other comprehensive loss	306	(36)
Balance at balance sheet date	$ 2,317	$ (59)