Fair Value Measurements Schedule of Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Senior Notes | Senior Notes Due 2026 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Fair value of senior notes | $ 394,480 | $ 372,000 |
| Fair Value, Measurements, Recurring | Level 1 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Derivative Liability | 0 | 0 |
| Derivative Asset | 0 | 0 |
| Fair Value, Measurements, Recurring | Level 2 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Derivative Liability | 325 | 6,051 |
| Derivative Asset | 0 | 1,632 |
| Fair Value, Measurements, Recurring | Level 3 | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Derivative Liability | 0 | 0 |
| Derivative Asset | $ 0 | $ 0 |