Long-Term Debt - Schedule Of Consolidated Total Leverage Ratio (Details) - Line of Credit [Member]	Jun. 30, 2017
September 30, 2017 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	6.00
December 31, 2017 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	5.75
March 31, 2018 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	5.50
June 30, 2018 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	5.25
September 30, 2018 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	5.00
December 31, 2018 through and including March 31, 2019 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	4.50
June 30, 2019 through and including September 30, 2019 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	4.25
December 31, 2019 [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	4.00
March 31, 2020 and each fiscal quarter thereafter [Member]
Debt Instrument [Line Items]
Maximum Consolidated Total or Net Leverage Ratio	3.50