Income Taxes - Narrative (Details) - USD ($) $ in Thousands, shares in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
SNI options outstanding, held by employees		0.1
Deferred tax assets		$ 13,640	$ 65,366
Potential affect of unrecognized tax benefits on effective tax rate		1,600
Interest accrued on unrecognized tax benefits		600	1,200
Income Tax Benefit, Recognition of Previously Unrecognized Tax Benefits		2,500	6,000
Potential change in unrecognized tax benefits		900
Tax deductions resulting from exercise of share-based compensation awards		2,200	8,100	$ 14,300
Unrecognized tax deductions, share-based compensation		16,000	23,000
Excess tax expense of compensation plans	[1]		$ 8,571
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards		61,000
Operating loss carryforwards, deduction from share-based compensation		39,000
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 256,000

[1] * Net of tax payments related to shares withheld for vested stock and RSUs of $5,237 in 2015, $4,261 in 2014 and $6,270 in 2013.