Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Net operating loss carryforwards	$ 21,212	$ 15,210
Allowance for doubtful accounts	1,582	432
Inventory valuation reserves	2,205	3,734
Equity compensation	3,161	4,250
Goodwill	10,788	6,869
Accrued compensation	80	73
Foreign tax credit carryforward	2,365	865
Other	76	67
Total gross deferred tax assets	41,469	31,500
Valuation allowance	(1,053)	(1,093)
Total deferred tax assets, net	40,416	30,407
Deferred tax liabilities:
Property and equipment	(7,264)	(12,876)
Intangible assets	(13,375)	(18,249)
Convertible debt	(2,010)	(3,011)
Unearned revenue	(4,535)	0
Prepaid insurance and other	(338)	(216)
Total gross deferred tax liabilities	(27,522)	(34,352)
Net deferred tax assets	$ 12,894
Net deferred tax liabilities		$ (3,945)