Fair Value Measurements (Narrative) (Details)	Jun. 30, 2021	Dec. 31, 2020
Term Loan Due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading prices rate to calculate the fair value	100.30%	98.00%
6.75% Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading prices rate to calculate the fair value	104.50%	102.50%
6.75% Senior Notes | Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Stated rate	6.75%	6.75%