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Employee Benefit Plans (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended | 108 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2014 | Dec. 31, 2013 ShareBasedCompensationPlan | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Maximum Employer Subscription Rate | 75.00% | 50.00% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  | 5.00% |  |  |  | 5.00% |  |
401k plan cost |  | $ 1,700,000 |  | $ 1,600,000 | $ 1,400,000 |  |  |
Number Of Stock Plans |  | 2 |  |  |  |  |  |
Maximum percetage of total shares of common stock issued and outstanding eligible to be granted to executives, selected management employees, and non employee members of board of directors |  | 10.00% |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  | 4,300,000 |  |  |  |  |  |
Shares available for grant |  | 6,600,000 |  |  |  | 6,600,000 |  |
Maximum excercise life |  | 10 years |  |  |  |  |  |
Forfeitures On Restricted Stock Percentage |  | 7.00% |  |  |  |  |  |
Forfeiture On Restricted Stock Period |  | 5 years |  |  |  |  |  |
Stock or Unit Option Plan Expense |  | 0 |  | 0 | 0 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | 500,000 |  | 1,300,000 | 1,100,000 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance |  | 0 |  | 52,800 | 192,800 | 0 |  | 432,918
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value |  |  |  | 400,000 | 1,000,000 |  |  |
Compensation cost related to restricted shares |  | 8,800,000 |  | 7,700,000 | 8,400,000 |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  | 14,200,000 |  | 13,200,000 | 12,000,000 | 14,200,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms |  | 1 year 6 months |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 73,609 | 257,797 |  | 482,340 | 571,163 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased | $ 23.18 |  |  |  |  |  |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | 1,700,000 |  |  |  |  |  |  |
Stock Authorized Shares Employee Stock Purchase Plans |  | 1,500,000 |  |  |  |  |  |
Available Shares Employee Stock Purchase Plan |  | 1,300,000 |  |  |  |  |  |
Percentage Of Share Of Non Vested Stock Considered As Call Option |  | 85.00% |  |  |  | 85.00% |  |
Percentage of share of non-vested stock considered as put-option |  | 15.00% |  |  |  |  |  |
Allocated Share-based Compensation Expense |  | 800,000 |  | 300,000 |  |  |  |
Measurement Period |  | 20 days |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Cash Award Granted, Amount | 8,900,000 | 8,400,000 |  | 4,200,000 | 5,200,000 | 8,400,000 |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | 9,100,000 |  | 8,700,000 | 7,900,000 |  |  |
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent |  | 14,800,000 |  | 13,000,000 |  | 14,800,000 |  |
Deferred Compensation Arrangement with Individual, Distributions Paid | 9,200,000 | 7,100,000 |  | 5,500,000 | 5,900,000 | 7,100,000 |  |
Performance Share Units Granted | 73,609 |  |  |  |  |  |  |
Total awards under the 2009 plan |  | 0 |  |  |  | 0 |  |
2005 Incentive Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  | 33.00% |  |  | 20.00% |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | 3 years |  | 3 years | 5 years |  |  |
Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  | 100.00% |  |  |  |  |  |
Long-Term Incentive Cash Plan 2009 Grants [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Measurement Period |  | 30 days |  |  |  |  |  |
Minimum percentage of average price during measurement period |  | 75.00% |  |  |  |  |  |
Long-Term Incentive Cash Plan 2010 Grants [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Minimum percentage of average price during measurement period |  | 50.00% |  |  |  |  |  |
Executive Officer [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Deferred Compensation Arrangement with Individual, Compensation Expense |  | 5,300,000 |  | 7,300,000 | 6,500,000 |  |  |
Deferred Compensation Cash-based Arrangements, Liability, Current and Noncurrent |  | $ 11,100,000 |  | $ 11,700,000 |  | $ 11,100,000 |  |
Maximum Shares As Incentive Options Member |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Shares available for grant |  | 2,000,000 |  |  |  | 2,000,000 |  |
Grant Share Amount B [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Vesting percentage |  | 100.00% | [1] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period |  | 89,329 | [1] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased |  | $ 30.96 | [1] |  |  | $ 30.96 | [1] |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Vesting date |  | January 1, 2016 | [1] |  |  |  |  |
Maximum [Member] | Grant Share Amount B [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award percentage |  | 200.00% |  |  |  |  |  |
Minimum [Member] | Performance Shares [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award percentage |  | 0.00% |  |  |  |  |  |
[1] | Reflects the grant of performance share units (“PSUs”) to our executive officers. The estimated fair value of the PSUs on grant date was determined using a Monte Carlo simulation model. The PSUs provide for an award based on the performance of our common stock over a three-year period with the maximum award being 200% of the original awarded PSUs and the minimum amount being zero. The vested PSUs will be settled in an equivalent number of shares of our common stock unless the Compensation Committee of our Board of Directors elects to pay in cash.

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- Definition Maximum percetage of total shares of common stock issued and outstanding eligible to be granted to executives, selected management employees, and non employee members of board of directors. + References No definition available. + Details
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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date. + References No definition available. + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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