CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2016	Dec. 31, 2015
Preferred stock, par value (USD per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	2,000,000	2,000,000
Preferred stock, shares issued (shares)	0	0
Common stock, par value (USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	117,500,000	117,500,000
Common stock, shares issued (shares)	34,336,147	34,733,117
Common stock, shares outstanding (shares)	34,336,147	34,733,117
Convertible 2.5% notes, net
Convertible notes, interest rate (percent)	2.50%