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 |