Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	$ 4,618	$ 4,132	$ 14,840	$ 13,122
Less amount capitalized into qualifying real estate projects	(1,490)	(1,591)	(4,110)	(4,690)
Amount charged to operating expenses	3,128	2,541	10,730	8,432
Depreciation expense on capitalized stock-based compensation	139	241	586	710
Total stock-based compensation expense	3,267	2,782	11,316	9,142
Deferred income tax benefit	1,214	1,009	4,235	3,342
Stock option costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	698	674	2,677	2,574
Restricted stock costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	2,833	2,722	9,136	8,737
Performance share costs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation costs	$ 1,087	$ 736	$ 3,027	$ 1,811