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Equity (Stock Repurchase Program) (Details) - USD ($) | 2 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 24, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Feb. 15, 2016 | Dec. 21, 2015 | Sep. 21, 2015 | Aug. 13, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock exchange rate for CSE underlying HPU, Shares |  |  |  |  |  |  |  | 0.7
Stock Repurchase Program |  |  |  |  |  |  |  |
Repurchase of common stock, authorized amount |  |  |  |  |  | $ 50,000,000.0 | $ 50,000,000 |
Treasury stock, shares, acquired |  |  | 0 |  |  |  |  |
Stock repurchased and retired during period, shares |  | 5,700,000 |  |  |  |  |  |
Common stock value acquired including acquisition costs |  | $ 70,300,000 |  |  |  |  |  |
Repurchase of stock |  | $ 69,511,000 | $ 0 | $ 20,985,000 |  |  |  |
Average cost per share |  | $ 12.25 |  |  |  |  |  |
Available repurchase of common stock, authorized amount |  | $ 48,700,000 |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Stock Repurchase Program |  |  |  |  |  |  |  |
Repurchase of common stock, authorized amount |  |  |  |  | $ 50,000,000.0 |  |  |
Stock repurchased and retired during period, shares | 5,200,000 |  |  |  |  |  |  |
Repurchase of stock | $ 52,000,000 |  |  |  |  |  |  |
Average cost per share | $ 10.10 |  |  |  |  |  |  |

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