Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands |
12 Months Ended | |||
|---|---|---|---|---|
Jan. 22, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Subsequent Event [Line Items] | ||||
| Preferred stock, shares authorized | 100,000,000 | 100,000,000 | ||
| Net proceeds from issuance of preferred stock | $ 55,569 | $ 0 | $ 0 | |
| Subsequent Event | Series D Preferred Stock | ||||
| Subsequent Event [Line Items] | ||||
| Preferred stock, shares authorized | 1,000,000 | |||
| Preferred stock, share price (usd per share) | $ 25.00 | |||
| Preferred stock, fixed dividend rate | 6.50% | |||
| Net proceeds from issuance of preferred stock | $ 24,200 | |||
| Subsequent Event | Series D Preferred Stock | London Interbank Offered Rate (LIBOR) | ||||
| Subsequent Event [Line Items] | ||||
| Preferred stock, floating dividend rate | 5.09% | |||