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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 |  |  |

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