Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Current Income Tax Expense (Benefit)
Federal	$ 0	$ 0	$ 0
State	1,297	770	269
Foreign	697	515	208
Current Income Tax Expense (Benefit)	1,994	1,285	477
Deferred Income Tax Expense (Benefit)
Federal	9,779	8,249	3,933
State	1,324	2,315	1,105
Foreign	(698)	(274)	121
Deferred Income Tax Expense (Benefit)	10,405	10,290	5,159
Income tax provision	$ 12,399	$ 11,575	$ 5,636

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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