Debt - Senior Unsecured Notes (Details) - USD ($) |
Aug. 18, 2016 |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|---|
| Debt Instrument [Line Items] | |||
| Unamortized deferred financing costs | $ 38,812,000 | $ 41,577,000 | |
| Senior Unsecured Notes | |||
| Debt Instrument [Line Items] | |||
| Aggregate principal amount of debt | $ 300,000,000 | ||
| Stated interest rates | 4.45% | ||
| Debt issuance, percentage of principal amount | 99.378% | ||
| Proceeds from issuance of debt, net of transaction fees and expenses | $ 296,200,000 | ||
| Deferred financing costs | $ 3,000,000 | ||
| Unamortized deferred financing costs | $ 2,900,000 | ||
| Period Prior to June 15, 2026 | Senior Unsecured Notes | |||
| Debt Instrument [Line Items] | |||
| Redemption price, percent of principal amount | 100.00% |