Common Stock Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Combined common and preferred stock, shares authorized		250,000,000
Common stock, shares authorized	200,000,000	200,000,000	200,000,000
Common stock, par or stated value per share	$ 0.01	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000	50,000,000
Preferred stock, par or stated value per share	$ 0.01	$ 0.01	$ 0.01
Common stock reserved for incentive plan awards		2,865,957
Net proceeds from sale of stock		$ 2,345	$ 58,581	$ 399,505
Shares paid for tax withholding		49,514	39,504
Beethoven Acquisition [Member]
Class of Stock [Line Items]
Stock issued during period, shares	1,100,000
Net proceeds from sale of stock	$ 57,000
Common stock average share price	$ 51.81