Debt Obligations, net (Future Scheduled Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
2014 (remaining three months)	$ 0
2015	105,765
2016	926,403
2017	1,306,964
2018	615,705
Thereafter	1,105,407
Total principal maturities	4,060,244	4,196,589
Unamortized debt discounts, net	(13,228)	(38,464)
Total long-term debt obligations, net	4,047,016	4,158,125
Unsecured Debt
Debt Instrument [Line Items]
2014 (remaining three months)	0
2015	105,765
2016	926,403
2017	924,722
2018	600,000
Thereafter	870,000
Total principal maturities	3,426,890
Unamortized debt discounts, net	(9,075)
Total long-term debt obligations, net	3,417,815
Secured Debt
Debt Instrument [Line Items]
2014 (remaining three months)	0
2015	0
2016	0
2017	382,242
2018	15,705
Thereafter	235,407
Total principal maturities	633,354
Unamortized debt discounts, net	(4,153)
Total long-term debt obligations, net	$ 629,201

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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