Accumulated Other Comprehensive Income Roll Forward (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) Roll Forward [Line Items]
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	$ 9,768		$ 9,388
Unrealized gain on available-for-sale investments, net of tax (benefit)	387
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(15,237)
Other Comprehensive Income Loss Arising During Period Total Net of Tax	(14,850)
Foreign currency translation adjustment, net of tax (benefit)	(15,237)	837
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(7,127)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(21,984)
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Net of Tax	(7)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment Realized upon Sale or Liquidation, Net of Tax	0
Other Comprehensive Income Loss Reclassification Adjustments Total Net of Tax	(7)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	380	(2,640)
Other Comprehensive Income (Loss), Net of Tax	(14,857)	(1,803)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (31,752)		$ (16,515)