CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Allowance for loss	$ 62,896	$ 52,855
Accumulated amortization	$ 94,221	$ 68,043
Preferred stock, par value	$ 0.25	$ 0.25
Preferred stock, shares authorized	1,000,000	1,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.25	$ 0.25
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	83,792,000	69,977,000
Total assets of variable interest entities	$ 389,000
Total liabilities of variable interest entities	$ 40,000