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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, 2017
USD ($)
vote
plan
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