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Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 440,656 us-gaap_Revenues | $ 430,525 us-gaap_Revenues | $ 413,806 us-gaap_Revenues | $ 400,075 us-gaap_Revenues | $ 394,169 us-gaap_Revenues | $ 389,189 us-gaap_Revenues | $ 378,207 us-gaap_Revenues | $ 301,356 us-gaap_Revenues | $ 1,685,061 us-gaap_Revenues | $ 1,462,921 us-gaap_Revenues | $ 1,000,627 us-gaap_Revenues
Income from continuing operations | 142,530 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 241,001 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 172,197 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 103,420 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 88,209 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (15,949)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 334 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | (14,767)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 659,148 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 57,827 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | 250,431 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Total discontinued operations | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 0 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 38,179 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 163,881 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 5,063 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 35,763 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 90,237 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 38,179 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 294,944 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax | 173,131 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax
Net income attributable to common stockholders | $ 142,642 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 241,100 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 158,086 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 141,739 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 252,212 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (10,715)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 36,218 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 75,427 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 683,567 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 353,141 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 423,869 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss) per common share - basic (in dollars per share) | $ 1.08 us-gaap_EarningsPerShareBasic | $ 1.83 us-gaap_EarningsPerShareBasic | $ 1.22 us-gaap_EarningsPerShareBasic | $ 1.09 us-gaap_EarningsPerShareBasic | $ 1.95 us-gaap_EarningsPerShareBasic | $ (0.08)us-gaap_EarningsPerShareBasic | $ 0.28 us-gaap_EarningsPerShareBasic | $ 0.63 us-gaap_EarningsPerShareBasic | $ 5.22 us-gaap_EarningsPerShareBasic | $ 2.78 us-gaap_EarningsPerShareBasic | $ 4.34 us-gaap_EarningsPerShareBasic
Net income (loss) per common share - diluted (in dollars per share) | $ 1.08 us-gaap_EarningsPerShareDiluted | $ 1.83 us-gaap_EarningsPerShareDiluted | $ 1.21 us-gaap_EarningsPerShareDiluted | $ 1.09 us-gaap_EarningsPerShareDiluted | $ 1.95 us-gaap_EarningsPerShareDiluted | $ (0.08)us-gaap_EarningsPerShareDiluted | $ 0.28 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ 5.21 us-gaap_EarningsPerShareDiluted | $ 2.78 us-gaap_EarningsPerShareDiluted | $ 4.32 us-gaap_EarningsPerShareDiluted

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