Income Taxes from Continuing Operations (Details) - Net Deferred Income Taxes - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Valuation allowance	$ (9,900)	$ (8,800)	$ (1,100)
Deferred Taxes Current [Member]
Deferred tax assets:
Net operating loss carry-forward	554	982
Stock-based compensation	0	0
Chargeback reserves	0	83
Reserve for product returns	16,208	17,932
Inventory valuation reserve	11,503	7,819
Long-term debt	0	0
Other	16,957	19,085
Total deferred tax assets	45,222	45,901
Valuation allowance	0	0
Net deferred tax assets	45,222	45,901
Deferred tax liabilities:
Prepaid expenses	(3,091)	(2,877)
Inventory step-up	0	0
Unamortized discount – convertible notes	0	0
Depreciation & amortization – tax over book	0	0
Other	0	0
Total deferred tax liabilities	(3,091)	(2,877)
Net deferred income tax asset	42,131	43,024
Deferred Taxes Noncurrent [Member]
Deferred tax assets:
Net operating loss carry-forward	25,103	22,356
Stock-based compensation	8,922	9,032
Chargeback reserves	0	0
Reserve for product returns	0	0
Inventory valuation reserve	0	0
Long-term debt	6,383	9,448
Other	1,851	1,236
Total deferred tax assets	42,259	42,072
Valuation allowance	(9,856)	(8,807)
Net deferred tax assets	32,403	33,265
Deferred tax liabilities:
Prepaid expenses	0	0
Inventory step-up	0	0
Unamortized discount – convertible notes	0	(267)
Depreciation & amortization – tax over book	(226,855)	(260,622)
Other	0	(1)
Total deferred tax liabilities	(226,855)	(260,890)
Net deferred income tax liability	$ (194,452)	$ (227,625)