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Long-Term Debt - Notes Narrative (Details) - USD ($) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 10, 2017 | Sep. 30, 2016 | May 09, 2013 | Sep. 30, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument Percentage Of Outstanding Principal Amount Redeemable Upon Event Of Default |  |  |  | 25.00% |
Debt outstanding |  |  |  | $ 918,199,000 | $ 956,017,000
Mortgage notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt weighted average interest rate on note |  |  |  | 4.47% |
Debt outstanding |  |  |  | $ 378,900,000 |
5.0% Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes Redemption Price Percentage Of Par Value Due To Change Of Control |  |  | 101.00% |  |
Stated interest rate |  |  | 5.00% | 5.00% |
Principal amount |  |  | $ 300,000,000.0 |  |
Notes issued, percent of principal |  |  | 100.00% |  |
Outstanding notes repurchased amount |  | $ 10,700,000 |  |  |
Repurchase amount paid in cash, plus accrued and unpaid interest related thereto |  | $ 10,600,000 |  |  |
Maximum dividend (usd per share) |  |  | $ 0.10 |  |
6.125% Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 106.125% |
Notes Redemption Price Percentage Of Par Value Due To Change Of Control | 101.00% |  |  |  |
Stated interest rate | 6.125% |  |  | 6.125% |
Principal amount | $ 250,000,000.0 |  |  |  |
Notes issued, percent of principal | 100.00% |  |  |  |
Maximum dividend (usd per share) |  |  |  | $ 0.12 |
Minimum | 5.0% Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument Other Outstanding Indebtedness In Excess |  |  |  | $ 50,000,000.0 |
Maximum | 6.125% Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redemption percentage of principal amount |  |  |  | 35.00% |

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- Definition Minimum amount of outstanding indebtedness the entity or its subsidiaries must have under other agreements in order to allow an acceleration of the entity's debt obligation if certain events of default occur. + References No definition available. + Details
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