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Benefit Plans (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Long-Term Incentive Plan (LTIP) [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance as awards | 23,000 |  |
Non-Vested Share Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost on awards | $ 88,200 |  |
Recognized compensation cost, weighted-average period, years | 2 years 15 days |  |
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% |  |
Share Options Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance as awards | 12,900 |  |
Unrecognized compensation cost on awards | $ 0 |  |
Share options award, outstanding | 458 |  |
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% |  |
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% |  |
Performance Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation cost on awards | $ 6,300 |  |
Recognized compensation cost, weighted-average period, years |  | 2 years |
Share option awards, exercisable, increment | 3 years |  |
Performance awards, granted, aggregate grant-date fair value | $ 8,300 | $ 7,400 | $ 8,200
Performance awards, vested, aggregate fair value | 4,600 | 6,900 | 7,400
Recognized compensation expense | $ 2,900 | 3,400 | 6,600
Savings Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares reserved for issuance as awards | 1,000 |  |
Share awards, vest rate | 33.00% |  |
Share option awards, exercisable, increment | 3 years |  |
Employee match | 100.00% |  |
Total matching contributions | $ 18,900 | 20,700 | 21,100
Profit sharing contribution provisions | $ 27,500 | $ 30,700 | $ 55,300
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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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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