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Shareholders' Equity (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 28, 2013 $ / shares | Feb. 29, 2012 $ / shares | Dec. 31, 2017 USD ($) plans $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Dividends per share of common stock (in dollars per share) | $ / shares | $ 0.20 | $ 0.15 | $ 0.80 | $ 0.80 | $ 0.80
Dividends payable |  |  | $ 5,592,000 | $ 5,566,000 | $ 5,542,000
Preferred stock, shares authorized | shares |  |  | 500,000 | 500,000 |
Preferred stock, par value (in dollars per per share) | $ / shares |  |  | $ 0.01 | $ 0.01 |
Shares authorized under repurchase program |  |  | $ 200,000,000.0 |  |
Total stock repurchased under plan, shares | shares |  |  | 6,100,000 |  |
Total stock repurchased under plan, value |  |  | $ 162,600,000 |  |
Remaining authorized repurchase amount |  |  | $ 37,400,000 |  |
Number of shares reserved for share-based compensation plans | shares |  |  | 8,900,000 |  |
Number of share-based compensation plans | plans |  |  | 3 |  |
Number of shares available for grant | shares |  |  | 900,000 |  |
Vesting term (in years) |  |  | 5 years |  |
Stock-based compensation |  |  | $ 8,472,000 | $ 8,375,000 | 7,499,000
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost |  |  |  | 700,000 | 1,000,000
Tax benefit from stock-based compensation |  |  | 2,000,000 | 3,100,000 | 2,700,000
Proceeds from stock options exercised |  |  | $ 1,000,000 | $ 0 | $ 200,000
Stock Options and Stock Appreciation Rights (SARs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period from date of grant (in years) |  |  | 10 years |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(15)(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(24)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: 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(20)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + 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=96867065&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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