CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Receivables, allowance	$ 13,960	$ 14,850
Preferred stock, shares issued	0	0
Common stock, shares issued	91,428,274	94,080,840
Common stock, shares outstanding	91,428,274	94,080,840
Common stock, par value (dollars per share)	$ 0.01	$ 0.01