Fair Value Measures (Fair Value of Assets and Liabilities, Measured on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap assets	$ 0	$ 5,509
Interest rate swap liabilities	(15,350)	(7,384)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CMBS	54,455	58,646
Interest rate swap assets		5,509
Total assets	54,455	64,155
Interest rate swap liabilities	(15,350)	(7,384)
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CMBS	0	0
Interest rate swap assets		0
Total assets	0	0
Interest rate swap liabilities	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CMBS	0	0
Interest rate swap assets		5,509
Total assets	0	5,509
Interest rate swap liabilities	(15,350)	(7,384)
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
CMBS	54,455	58,646
Interest rate swap assets		0
Total assets	54,455	58,646
Interest rate swap liabilities	$ 0	$ 0