Subsequent Events (Details) - Second Amended and Restated Credit Agreement [Member] - New Senior Secured Credit Facility [Member] - Wells Fargo Bank [Member] - Subsequent Event [Member] $ in Millions	May 01, 2019 USD ($)
Commencing on Quarter Ending June 30, 2017 through Quarter Ending Prior to March 31, 2018 [Member]
Subsequent Events [Line Items]
Leverage ratio	2.50%
Commencing on Quarter Ending June 30, 2017 through Last Day of Each Fiscal Quarter [Member]
Subsequent Events [Line Items]
Interest coverage ratio	2.75%
If Leverage Ratio as of End of Any Fiscal Quarter is Greater than 2.00 to 1.00 and the Amount Outstanding Under the Canadian Facility at Any Time During such Fiscal Quarter was Greater than $0 [Member]
Subsequent Events [Line Items]
Asset coverage ratio	1.00%
If Leverage Ratio as of End of Any Fiscal Quarter is Greater than 2.00 to 1.00 and Amount Outstanding Under U.S. Facility at Any Time During such Fiscal Quarter was Greater than $0 [Member]
Subsequent Events [Line Items]
Asset coverage ratio	1.00%
Revolving Credit U.S. Facility [Member]
Subsequent Events [Line Items]
Line of credit available aggregate principal amount	$ 50.0
Revolving Credit Canadian Facility [Member]
Subsequent Events [Line Items]
Line of credit available aggregate principal amount	25.0
Letter of Credit [Member]
Subsequent Events [Line Items]
Line of credit available aggregate principal amount	5.0
Swingline Loans [Member]
Subsequent Events [Line Items]
Line of credit available aggregate principal amount	$ 5.0