Subsequent Events - Additional Information (Details) - USD ($)		3 Months Ended				12 Months Ended
	Mar. 09, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 30, 2014
Subsequent Event [Line Items]
Maximum borrowing capacity on line of credit									$ 300,000,000
Restructuring Charges						$ 0	$ 2,411,000	$ 1,213,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Restructuring Charges	$ 10,000,000
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Expected restructuring reserve		$ 10,000,000
Loan Amendment Agreement [Member]
Subsequent Event [Line Items]
Loan maturity period						2018-12
Loan Amendment Agreement [Member] | Extended Maturity [Member]
Subsequent Event [Line Items]
Loan maturity period						2022-03
Loan Amendment Agreement [Member] | Scenario, Forecast [Member]
Subsequent Event [Line Items]
Maximum borrowing capacity on line of credit					$ 200,000,000
Maximum leverage ratio		3.25%	3.50%	3.75%	3.75%