Fair Value Measurements - Level 3 Inputs (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate	0.00%	(8.30%)
Fair Value Inputs, Discount Rate	9.00%	10.50%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Long-term Revenue Growth Rate		2.50%
Fair Value Inputs, Discount Rate		10.50%
Overall Cap Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	8.00%	8.30%
Overall Cap Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate		8.50%
Terminal Cap Rate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate	8.50%	8.80%
Terminal Cap Rate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair Value Inputs, Cap Rate		8.80%