Income Taxes (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		12 Months Ended
	Dec. 17, 2015	Dec. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Income Tax Contingency [Line Items]
Income tax benefit			$ 7,498	$ 6,026
Term of cumulative pretax net losses			3 years
Term of improvement in book income			5 years
FTC Contempt Action | Settled Litigation
Income Tax Contingency [Line Items]
Payments for legal settlements	$ 100,000	$ 100,000
Loss contingency, cumulative accrual		$ 16,000
Settlement amount					$ 116,000
Legal Reserve
Income Tax Contingency [Line Items]
Reserves					$ 96,000	$ 20,000