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Acquisitions and Divestitures - Gulf Properties Disposal - Revenue and Expense Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 143,642	$ 180,152	$ 229,607	$ 215,308	$ 346,881	$ 394,107	$ 374,714	$ 443,056	$ 768,709	$ 1,558,758	$ 1,983,388
Expenses									$ 5,411,387	968,534	2,152,389
Gulf Properties \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues										90,920	627,236
Expenses										$ 63,674	$ 491,991