Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred tax valuation allowance
Valuation and Qualifying Accounts
Balance at Beginning of Year	$ 1,000	$ 0	$ 79,693
Charged to Expense	2,071	1,000	0
Deductions	0	0	79,693
Balance at End of Year	3,071	1,000	0
Allowance for sales returns
Valuation and Qualifying Accounts
Balance at Beginning of Year	15,531	13,232	10,618
Charged to Expense	142,887	117,932	95,807
Deductions	140,522	115,633	93,193
Balance at End of Year	17,896	15,531	13,232
Allowance for doubtful accounts
Valuation and Qualifying Accounts
Balance at Beginning of Year	511	152	797
Charged to Expense	217	359	161
Deductions	263	0	806
Balance at End of Year	$ 465	$ 511	$ 152