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Stockholders' Equity (Details) (USD $)	12 Months Ended
Stockholders' Equity (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2014	Aug. 20, 2014	Aug. 17, 2012
Stockholders' Equity Note [Abstract]
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01	$ 0.01	$ 0.01
Maximum price of common stock available to be issued				$ 500,000,000	$ 500,000,000
Commission to sales agent (as a percent)					2.00%
Common stock sold (in shares)	2,456,956	2,961,903
Proceeds from sale	173,011,000	177,896,000
Shares issued during the period	$ 171,102,000	$ 175,649,000