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Capital Stock (Narrative) (Details) - USD ($) | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Capital Stock [Abstract] |  |
Authorized amount of shares repurchase | $ 669,000,000 | $ 1,000,000,000
Preferred stock, shares authorized (in shares) | 30,000,000 | 30,000,000
Debt restrictions on Company's ability to pay dividends and repurchase its common stock | The amount of restricted payments permitted to be made, including dividends and repurchases of the Company’s common stock, may be limited to the cumulative excess of $200 plus 50% of adjusted net income plus proceeds from the exercise of employee stock options over the aggregate of restricted payments made since July 2004. |
Limited cumulative excess amount, maximum | $ 200,000,000 |
Debt restrictions on payment of dividends and repurchase of common stock, percentage adjustment | 50.00% |

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- Definition Debt Restrictions On Payment Of Dividends And Repurchase Of Common Stock. + References No definition available. + Details
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- Definition Debt Restrictions On Payment Of Dividends And Repurchase Of Common Stock, Limited Cumulative Excess Amount, Maximum + References No definition available. + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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