Fair Value Measurements (Assets Measured On Nonrecurring Basis) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property, net	$ 3,353,850	[1]	$ 3,162,052	[1]
Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	11,876		0
Total Gains (Losses)	(2,358)	[2]
Nonrecurring [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property	11,876	[3]
Total Gains (Losses)	(2,358)	[2],[3]
Property, net	14,300
Nonrecurring [Member] | Quoted Prices In Active Markets For Identical Assets And Liabilities (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	3,300
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property	3,300	[3]
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total	8,576
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Impaired Property [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property	$ 8,576	[3]

[1] Consolidated variable interest entities' assets held as collateral and debt included in the above balances (see Note 16):

[2] Total gains (losses) are reflected throughout 2013 and exclude impairments on disposed assets because they are no longer held by us.

[3] In accordance with our policy of evaluating and recording impairments on the disposal of long-lived assets, property with a carrying amount of $14.3 million was written down to a fair value of $11.9 million, resulting in a loss of $2.4 million, which was included in earnings for the period. Management’s estimate of the fair value of these properties was determined using bona fide purchase offer for the Level 2 inputs. See the quantitative information about the significant unobservable inputs used for our Level 3 fair value measurements table below.