Bank Debt (Amended Credit Facility Maximum Leverage Ratio) (Details)	Dec. 31, 2017
Line of Credit Facility [Line Items]
Leverage Ratio	240.00%
December 31, 2017 and March 31, 2018 [Member]
Line of Credit Facility [Line Items]
Leverage Ratio	425.00%
June 30, 2018 and September 30, 2018 [Member]
Line of Credit Facility [Line Items]
Leverage Ratio	400.00%
December 31, 2018 [Member]
Line of Credit Facility [Line Items]
Leverage Ratio	375.00%
March 31, 2019 and June 30, 2019 [Member]
Line of Credit Facility [Line Items]
Leverage Ratio	350.00%