Debt - Borrowing Thresholds (Details) - Revolving Loan [Member] $ in Thousands	Sep. 30, 2017 USD ($)
Four Quarter Period Ending Sep 30 2017 And Dec 31 2017 [Member]
Debt Instrument [Line Items]
EBITDA is greater than or equal to	$ 30,000
Four Quarter Period Ending March 31, 2018 [Member]
Debt Instrument [Line Items]
EBITDA is greater than or equal to	32,500
Four Quarter Period Ending June 30, 2018 And Each Quarter Thereafter [Member]
Debt Instrument [Line Items]
EBITDA is greater than or equal to	$ 35,000