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Quarterly Financial Information (Unaudited) (Restatement Amounts for Discontinued Operations Adjustment) (Details) (USD $) In Thousands, 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 Data [Abstract]
Revenues	$ 803,987us-gaap_Revenues	$ 779,035us-gaap_Revenues	$ 751,254us-gaap_Revenues	$ 741,470us-gaap_Revenues	$ 733,185us-gaap_Revenues	$ 711,249us-gaap_Revenues	$ 684,109us-gaap_Revenues	$ 682,909us-gaap_Revenues	$ 3,075,746us-gaap_Revenues	$ 2,811,452us-gaap_Revenues	$ 2,469,615us-gaap_Revenues
Income from continuing operations attributable to common stockholders	107,601	109,391	138,653	118,016	108,555	127,470	133,139	120,624	473,661	489,788	308,814
Discontinued operations	(411)	(259)	(255)	3,031	(115)	(9,174)	(18,559)	(8,431)	2,106	(36,279)	53,986
Previously Reported
Quarterly Financial Data [Abstract]
Revenues					732,856	710,924	683,764	682,509
Income from continuing operations attributable to common stockholders					108,338	127,268	132,895	120,429
Discontinued operations					102	(8,972)	(18,315)	(8,236)
Restatement Adjustment
Quarterly Financial Data [Abstract]
Revenues					329	325	345	400
Income from continuing operations attributable to common stockholders					217	202	244	195
Discontinued operations					$ (217)	$ (202)	$ (244)	$ (195)

Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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