Stockholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended				12 Months Ended
	Feb. 02, 2016	Jul. 19, 2013	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2006
Stockholders Equity (Textual) [Abstract]
Common stock, outstanding shares			101,517,000				101,517,000	98,828,000
Issuance of common stock		3,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01				$ 0.01	$ 0.01
Net price per share		$ 26.13
Proceeds from issuance of common stock, net		$ 78,300					$ 66,942	$ 76,856	$ 220,252
Dividend per share to common stockholders, paid (in dollars per share)			$ 0.3	$ 0.3	$ 0.3		$ 1.2	$ 1.20	$ 1.20
Dividends per share to common stockholders, declared (in dollars per share)						$ 0.30
Number of common shares authorized to be repurchased										3,000,000
Other comprehensive income loss reduction in future benefit obligations related to pension plan							$ 2,500	$ 2,600
Increase to accumulated other comprehensive loss							(1,684)	$ 0	$ 0
Subsequent Event [Member] | Dividend Declared [Member]
Stockholders Equity (Textual) [Abstract]
Dividends per share to common stockholders, declared (in dollars per share)	$ 0.30
Forward Starting Interest Rate Swap [Member]
Stockholders Equity (Textual) [Abstract]
Increase to accumulated other comprehensive loss							$ 1,600