Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Amount of stock-based compensation costs and related deferred income tax benefit recognized in the financial statements
Total stock-based compensation costs	$ 4,191	$ 5,339	$ 10,222	$ 8,990
Less amount capitalized into qualifying real estate projects	(555)	(1,666)	(2,620)	(3,099)
Amount charged to operating expenses	3,636	3,673	7,602	5,891
Depreciation expense on capitalized stock-based compensation	189	245	447	469
Total stock-based compensation expense	3,825	3,918	8,049	6,360
Deferred income tax benefit	1,455	1,453	3,021	2,333
Stock option costs [Member]
Amount of stock-based compensation costs and related deferred income tax benefit recognized in the financial statements
Total stock-based compensation costs	523	1,309	1,979	1,900
Restricted stock costs [Member]
Amount of stock-based compensation costs and related deferred income tax benefit recognized in the financial statements
Total stock-based compensation costs	2,579	3,294	6,303	6,015
Performance share costs [Member]
Amount of stock-based compensation costs and related deferred income tax benefit recognized in the financial statements
Total stock-based compensation costs	$ 1,089	$ 736	$ 1,940	$ 1,075