Stockholders' Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Nov. 15, 2013
Stockholders Equity [Line Items]
Stock repurchase program, authorized amount				$ 70,000,000
Dividends declared, per share	$ 0.50
Common stock dividends declared, quarterly	$ 0.125
Payments of Dividends	$ 25,434,000	$ 25,039,000	$ 18,633,000