Long-term Debt - Other Covenant Terms (Details) - Restated Credit Agreement - Maximum	9 Months Ended
	Sep. 30, 2017
Term Loan A
Ratio requirements
Secured Leverage Ratio covenant, through September 2018	5.50
Secured Leverage Ratio covenant, through September 2019	5.25
Secured Leverage Ratio covenant, through June 2021	5.00
Revolver
Ratio requirements
Secured Leverage Ratio covenant, through September 2018	5.50
Secured Leverage Ratio covenant, through September 2019	5.25
Secured Leverage Ratio covenant, through June 2021	5.00