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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 10, 2013 | Jun. 25, 2013 | May 23, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jan. 10, 2014 Subsequent Event [Member] | Dec. 31, 2013 Common Stock Buyback [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Time-based [Member] | Dec. 31, 2013 2007 Equity Compensation Plan [Member] plans | Dec. 31, 2013 2007 Equity Compensation Plan [Member] Tranche One [Member] | Dec. 31, 2013 2007 Equity Compensation Plan [Member] Tranche Two [Member] | Dec. 31, 2013 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of active equity compensation plans |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Number of shares available for grant |  |  |  | 744,000 |  |  |  |  |  |  |  | 20,000,000 |  |  |
Vesting rate |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |
Stock options vesting period, years |  |  |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Weighted average fair value of stock options granted |  |  |  | $ 10.45 | $ 6.73 | $ 5.70 |  |  |  |  |  |  |  |  |
Change in management estimate of stock-based compensation expense amortization |  |  |  | $ 19,637 |  |  |  |  |  |  |  |  |  |  |
Unrecognized compensation cost |  |  |  | 37,266 |  |  |  |  |  |  |  |  |  |  |
Weighted average period for recognition of unrecognized compensation cost |  |  |  | 2 years 6 months 22 days |  |  |  |  |  |  |  |  |  |  |
Total options that were exercisable |  |  |  | 14,601,000 | 9,760,000 | 11,680,000 |  |  |  |  |  |  |  |  |
Expiration date for options outstanding |  |  |  |  |  |  |  |  | Dec. 14, 2014 | Dec. 10, 2023 |  |  |  |  |
Options outstanding weighted average remaining contractual life, years |  |  |  | 5 years 8 months 16 days |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised |  |  |  | 47,392 | 19,565 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable |  |  |  | 223,061 |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options outstanding |  |  |  | 287,237 |  |  |  |  |  |  |  |  |  |  |
Share price |  |  |  | $ 34.73 |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan, employee eligible percentage on offerings of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 85.00%
Shares reserved under the plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,600,000
Issuance of common stock under the employee stock purchase plan, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,658,000
Remaining stock repurchase authorization amount |  |  |  |  |  |  |  | 81,070 |  |  |  |  |  |  |
Rights received by common shareholder for each common share outstanding, rights |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |
Series A Junior Participating Preferred stock, par value |  |  |  | $ 0.05 | $ 0.05 |  |  |  |  |  |  |  |  |  |
Securities and assets of equivalent value, purchase price, per unit |  |  |  | $ 150 |  |  |  |  |  |  |  |  |  |  |
Number of days, rights become exercisable following public announcement |  |  |  | 0 years 0 months 10 days |  |  |  |  |  |  |  |  |  |  |
Acquiring Person, beneficial ownership of the outstanding common stock, minimum percentage |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |
Common shares received by holders upon surrender of rights, percentage |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Rights non-voting, redeemable days |  |  |  | 0 years 0 months 10 days |  |  |  |  |  |  |  |  |  |  |
Right redeemable price, per right |  |  |  | 0.01 |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share | $ 0.22 |  | $ 0.20 | $ 0.42 | $ 0.63 | $ 0.27 |  |  |  |  |  |  |  |  |
Dividends paid per common share |  | $ 0.20 |  |  |  |  | $ 0.22 |  |  |  |  |  |  |  |
Dividends declared |  |  |  | $ 71,665 | $ 108,817 | $ 48,558 |  |  |  |  |  |  |  |  |

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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 maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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