Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ (977)
Reclassification into net revenue, non-directly delivered programs	$ 8,090	$ 10,818	24,708	$ 29,027
Reclassification into interest and dividend income	142	84	428	356
Balance, end of period	(102)		(102)
Realized gain (loss) on sale of investments			0	0
Derivative Securities [Member] | Foreign Currency Exchange Contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(220)	164	(1,142)	(192)
Change before reclassification	220	(690)	1,241	(310)
Reclassification into net revenue, non-directly delivered programs	0	5	(99)	(19)
Reclassification into interest and dividend income	0	0	0	0
Effect of incomes taxes, Derivative Securities	0	0	0	0
Other comprehensive income (loss), net of income taxes	220	(685)	1,142	(329)
Balance, end of period	0	(521)	0	(521)
Available-for-sale securities [Member] | Foreign Currency Exchange Contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(157)	(90)	165	(357)
Change before reclassification	55	12	(267)	272
Reclassification into net revenue, non-directly delivered programs	0	0	0	0
Reclassification into interest and dividend income	0	(14)	0	(6)
Effect of income taxes, Available-for-sale securities	0	0	0	0
Other comprehensive income (loss), net of income taxes	55	(2)	(267)	266
Balance, end of period	$ (102)	$ (91)	$ (102)	$ (91)