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Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net | $ 3,949,505 | $ 3,979,300
Parent |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net | 3,949,505 | 3,979,300
Parent | Level 3 | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitments, Fair Value Disclosure | 29,431 | 29,943
Parent | Level 3 | Fair Value, Measurements, Nonrecurring [Member] | Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitments, Fair Value Disclosure | 24,128 | 24,477
Parent | Level 3 | Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitments, Fair Value Disclosure | 29,141 | 29,591
Senior Notes [Member] | 6.000% Senior Notes Due 2026 [Member] | Parent | Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, net | $ 689,710 | $ 689,361

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