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Long-term Debt - Senior Notes (Details) - Senior Notes [Member] - 4.875% Senior Unsecured Notes Due 2025 [Member] $ in Millions | 6 Months Ended
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Jun. 30, 2018 USD ($)
Debt Instrument [Line Items] |
Debt Instrument, Face Amount | $ 300.0
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
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%
October 15, 2020 to October 14, 2021 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 102.438%
October 15, 2021 to October 14, 2022 [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 101.219%
October 15, 2022 and thereafter [Member] |
Debt Instrument [Line Items] |
Debt Instrument, Redemption Price, Percentage | 100.00%

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