Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ (977)
Reclassification into net revenue, non-directly delivered programs	$ 16,525	$ 18,092	16,619	$ 18,208
Reclassification into interest and dividend income	157	141	286	273
Effect of incomes taxes, Derivative Securities	0	69	0	0
Effect of income taxes, Available-for-sale securities	0	62	0	0
Balance, end of period	(377)		(377)
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	(2,034)	(65)	(1,142)	(192)
Change before reclassification	1,814	185	1,021	381
Reclassification into net revenue, non-directly delivered programs	0	(24)	(99)	(24)
Reclassification into interest and dividend income	0	0	0	0
Effect of incomes taxes, Derivative Securities	0	69	0	0
Other comprehensive income (loss), net of income taxes	1,814	230	922	357
Balance, end of period	(220)	165	(220)	165
Available-for-sale securities [Member] | Foreign Currency Exchange Contracts [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	95	(243)	165	(357)
Change before reclassification	(252)	83	(322)	259
Reclassification into net revenue, non-directly delivered programs	0	0	0	0
Reclassification into interest and dividend income	0	8	0	8
Effect of income taxes, Available-for-sale securities	0	62	0	0
Other comprehensive income (loss), net of income taxes	(252)	153	(322)	267
Balance, end of period	$ (157)	$ (90)	$ (157)	$ (90)