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Fair Value Measurements - Textuals (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Measurements, Nonrecurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Gains or losses related to non-financial assets and liabilities | $ 0 | $ 0 |
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt instrument interest rate (percent) | 5.125% |  | 5.125%
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt instrument interest rate (percent) | 5.75% |  | 5.75%
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt instrument interest rate (percent) | 5.75% |  | 5.75%

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