Basis of Presentation and Summary of Significant Accounting Policies - Impairment of Long-Lived Assets (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Asset Impairment Charges [Abstract]
Provision for real estate impairment losses	$ 1,820	$ 0	$ 6,235