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Net Income (Loss) Attributable to Controlling Interests Per Common Share Antidilutive Securities (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Nov. 30, 2005
May 31, 2005
Debt Instrument [Line Items]            
Shares related to unvested share-based payments included in basic and diluted shares (in shares) 249,665 428,597 236,107 428,039    
5.875% Convertible Senior Notes Due 2035 [Member]            
Debt Instrument [Line Items]            
Shares potentially issuable and includible in diluted net loss attributable to controlling interest per common share 0 0 0 0    
Debt Instrument, Interest Rate, Stated Percentage         5.875% 5.875%
Conversion price for convertible senior notes $ 24.61   $ 24.61      
Maximum potential dilution in future periods under the conversion provisions of convertible senior notes 3,600,000   3,600,000