Accumulated Other Comprehensive Income Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) Roll Forward [Line Items]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	$ 0		$ 0
Other Comprehensive Income Loss Reclassification Adjustments Total Net of Tax	(3,151)		(3,108)
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	90		90		$ 2,339	$ 2,449
Unrealized gain on available-for-sale investments, net of tax (benefit)	902		749
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax	(328)		(9,566)
Other Comprehensive Income Loss Arising During Period Total Net of Tax	574		(8,817)
Foreign currency translation adjustment	(328)	$ (4,652)	(9,566)	$ (12,777)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(38,472)		(29,124)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(41,049)		(41,049)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	(2,249)	(1,057)	(2,359)	(4,611)
Other Comprehensive Income (Loss), Net of Tax	(2,577)	$ (5,709)	(11,925)	$ (17,388)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	$ (41,139)		$ (41,139)		$ (40,811)	$ (31,573)