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Benefit Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period	4,542,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 41.34
Long-Term Incentive Plan (LTIP) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance as awards	27,500,000
Share Options Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance as awards	16,000,000
Unrecognized compensation cost on awards	$ 0
Share options award, outstanding	282,233
Non-Vested Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost on awards	$ 84,700
Recognized compensation cost, weighted-average period, years	2 years
Non-Vested Share Awards [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards, vest rate	33.00%
Non-Vested Share Awards [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards, vest rate	20.00%
Non-Vested Share Awards, Liability Classified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period	3,400,000
Non Vested Share Awards, Equity Classified [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period	1,100,000
Exercisable In Increments Over Three-Year Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards, vest rate	33.00%
Exercisable In Increments Over Four-Year Period [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share awards, vest rate	25.00%
Performance Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost on awards	$ 7,900
Recognized compensation cost, weighted-average period, years		1 year 10 months 24 days
Share option awards, exercisable, increment	3 years
Performance awards, granted, aggregate grant-date fair value	$ 6,100	$ 8,300	$ 7,400
Performance awards, vested, aggregate fair value	2,800	4,600	6,900
Recognized compensation expense	$ 3,100	2,900	3,400
Savings Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance as awards	1,000,000
Share awards, vest rate	33.00%
Share option awards, exercisable, increment	3 years
Employee match	100.00%
Total matching contributions	$ 16,700	18,900	20,700
Profit sharing contribution provisions	$ 19,200	$ 27,500	$ 30,700
Savings Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum percentage of eligible employee compensation to be matched by employer	5.00%

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