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Equity (High Performance Unit Program) (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 13, 2015 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) vote plan shares | Dec. 31, 2016 shares
Class of Stock [Line Items] |  |  |
HPUs outstanding (in shares) | 14,888 |  |
Common stock equivalent underlying HPUs (in shares) | 2,800,000 |  |
Cash exchange rate for CSE underlying HPU (in dollars per share) | $ / shares | $ 9.30 |  |
Common stock exchange rate for CSE underlying HPU, Shares | 0.7 |  |
HPU cash value acquired | $ | $ 9.8 |  |
Stock issued during period (in shares) | 1,200,000 |  |
Stock issued | $ | $ 15.2 |  |
High performance units, value | $ | $ 9.8 |  |
HPU |  |  |
Class of Stock [Line Items] |  |  |
Stock performance award, number of voting rights per share | vote |  | 0.25 |
Percentage of holders with binding commitments to tender, cash redemption | 37.00% |  |
Percentage of holders with binding commitments to tender | 63.00% |  |
High Performance Unit Program |  |  |
Class of Stock [Line Items] |  |  |
Stock performance award initial purchase price of participant interest | $ |  | $ 9.8 |
Stock performance award, number of plans, not meet performance thresholds | plan |  | 4 |
High Performance Unit Program 2002 Plan | Employee Stock Performance Award Participant | HPU |  |  |
Class of Stock [Line Items] |  |  |
Stock performance award common stock shares basis for distribution calculation |  | 819,254 |
Stock performance award, shares outstanding, number |  | 5,000 |
High Performance Unit Program 2003 Plan | Employee Stock Performance Award Participant | HPU |  |  |
Class of Stock [Line Items] |  |  |
Stock performance award common stock shares basis for distribution calculation |  | 987,149 |
Stock performance award, shares outstanding, number |  |  | 5,000
High Performance Unit Program 2004 Plan | Employee Stock Performance Award Participant | HPU |  |  |
Class of Stock [Line Items] |  |  |
Stock performance award common stock shares basis for distribution calculation |  | 1,031,875 |
Stock performance award, shares outstanding, number |  |  | 5,000

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