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Income Taxes - Income Tax Expense (Benefit), Continuing Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current Income Tax Expense (Benefit)      
Federal $ 0 $ 0 $ 0
State 770 269 257
Foreign 515 208 70
Current Income Tax Expense (Benefit) 1,285 477 327
Deferred Income Tax Expense (Benefit)      
Federal 8,249 3,933 (1,626)
State 2,315 1,105 (167)
Foreign (274) 121 353
Deferred Income Tax Expense (Benefit) 10,290 5,159 (1,440)
Income tax provision (benefit) from continuing operations 11,575 5,636 (1,113)
Income tax provision from discontinued operations $ 0 $ 0 $ 1,097