Equity (Narratives) (Details) (USD $)	0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended
	Oct. 19, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2003 Officers WPCI	Dec. 31, 2008 Officers WPCI	Dec. 31, 2012 Officers WPCI	Jun. 30, 2003 Restricted Stock Units Officers WPCI	Dec. 31, 2013 Quarterly distribution	Dec. 31, 2013 Special distribution
Dividends Payable [Line Items]
Dividends payable (per share)									$ 0.87	$ 0.11
Redeemable Noncontrolling Interest
Share based incentive plan shares issued, RSU shares					1,500,000	1,500,000
Minority interest ownership interest						23.00%	7.70%	13.00%
Shares granted in period (options)					1,500,000
Weighted average contractual term		2 years 7 months 4 days	3 years 2 months 9 days	3 years 3 months 16 days	5 years
Shares issued under share incentive plans, value		$ (9,183,000)	$ 646,000		$ 2,500,000
Options exercised in period		169,412	410,331	449,660		1,500,000
Weighted average exercise price (per share)		$ 30.43	$ 25.94	$ 27.71		$ 1
Sales of Common Stock
Common stock, issued	937,500	69,299,949	68,901,933
Sales price of stock (per share)	$ 48
Proceeds from issuance of common stock	$ 45,000,000