Property Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Furniture and equipment	$ 409,076	$ 359,982
Transportation equipment	11,807	11,451
Building and leasehold improvements	294,221	314,343
Land and land improvements	6,747	6,853
Construction in progress	91,536	80,683
Property assets, gross	813,387	773,312
Accumulated depreciation	(482,448)	(440,586)
Property assets, net	330,939	332,726
Capitalized software costs included in construction in progress	70,300	73,400
Cost of internally developed software placed in service	$ 22,900	$ 51,600	$ 4,600