Income Taxes from Continuing Operations - Net Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Jun. 01, 2011
Deferred tax assets:
Valuation allowance	$ (8,800)		$ (8,600)
Deferred Taxes Current [Member]
Deferred tax assets:
Net operating loss carry-forward	982	$ 1,470
Chargeback reserves	83	2,276
Reserve for product returns	17,932	16,932
Inventory valuation reserve	7,819	7,854
Other	19,085	13,491
Total deferred tax assets	45,091	42,023
Deferred Tax Assets, Net of Valuation Allowance, Total	45,091	42,023
Deferred tax liabilities:
Prepaid expenses	(2,877)	(1,993)
Inventory step-up		(1,619)
Total deferred tax liabilities	(2,877)	(3,612)
Net deferred income tax asset (liability)	43,024	38,411
Deferred Taxes Noncurrent [Member]
Deferred tax assets:
Net operating loss carry-forward	22,344	14,390
Stock-based compensation	9,032	6,618
Long-term debt	9,448
Other	1,236	807
Total deferred tax assets	42,072	21,815
Valuation allowance	(8,807)	(1,116)
Deferred Tax Assets, Net of Valuation Allowance, Total	33,265	20,669
Deferred tax liabilities:
Unamortized discount - convertible notes	(267)	(1,776)
Depreciation & amortization - tax over book	(260,622)	(286,267)
Other	(1)
Total deferred tax liabilities	(260,890)	(288,043)
Net deferred income tax asset (liability)	$ (227,625)	$ (267,344)