Stock-Based Compensation and Equity (Narratives) (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jun. 30, 2014 Officers WPCI	Jun. 30, 2014 CPA: 16 - Global	Mar. 31, 2014 CPA: 16 - Global	Jan. 31, 2014 CPA: 16 - Global	Jun. 30, 2014 CPA: 16 - Global Measurement period adjustment
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense	$ 7,957,000	$ 8,429,000	$ 15,000,000	$ 17,578,000
Tax benefit from stock based compensation expense	0	0	17,300,000	16,000,000
Risk free interest rate			0.65%
Fair value assumptions expected volatility rate			25.89%
Fair value assumptions expected volatility rate peer index			21.77%
Fair value assumptions expected dividend rate			0.00%
Fair value of vested stock			23,900,000
Deferred compensation, shares	889,863		889,863
Deferred compensation obligation	30,624,000		30,624,000		11,354,000
Unrecognized stock based compensation expense	37,300,000		37,300,000
Weighted-average remaining term			1 year 9 months 11 days
Options exercised in period			51,900
Options exercised during the period, aggregate intrinsic value			1,700,000
Fair value of noncontrolling interests acquired							278,187,000	278,829,000	278,187,000	(642,000)
Stock options outstanding	566,880		566,880
Stock options exercisable	495,169		495,169
Distributions Declared
Distributions declared	$ 0.900	$ 0.840	$ 1.795	$ 1.660	$ 3.39
Dividend payable date			Jul. 15, 2014
Redeemable Noncontrolling Interest
Minority interest ownership interest						7.70%
Redeemable noncontrolling interest	$ 6,418,000		$ 6,418,000		$ 7,436,000