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v3.19.2

Long-term Debt - Senior Notes (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Debt Instrument [Line Items] |  |
Cash paid for interest | $ 6,190 | $ 7,630
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 300,000 |
Debt Instrument, Interest Rate, Stated Percentage | 4.875% |
Debt Instrument, Maturity Date | Oct. 15, 2025 |
Debt Instrument, Date of First Required Payment | Apr. 15, 2018 |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | Prior to October 15, 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Percentage of principal that can be redeemed with cash from proceeds of an equity offering | 35.00% |
Debt instrument redemption price with net proceeds from equity offering | 104.875% |
Debt Instrument, Redemption Price, Percentage | 100.00% |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2020 to October 14, 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 102.438% |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2021 to October 14, 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 101.219% |
Senior Notes [Member] | 4.875% Senior Unsecured Notes Due 2025 [Member] | October 15, 2022 and thereafter [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |

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