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Share Repurchase Program Share Repurchase Program (Narrative) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 18, 2017 | Dec. 31, 2017 | Dec. 31, 2015 | Oct. 25, 2017 | Feb. 25, 2016
Related Party Transaction [Line Items] |  |  |  |  |
Authorized amount |  |  |  | $ 40,000,000.0 | $ 25,000,000.0
Authorized amount, additional |  |  |  | $ 15,000,000.0 |
Treasury stock acquired, shares |  | 574,054 | 1,927,665 |  |
Payments for repurchase of equity |  | $ 14,000,000 | $ 45,000,000 |  |
Average cost per share (in usd per share) |  | $ 24.35 | $ 23.34 |  |
Board of Directors Chairman [Member] | Share Repurchase [Member] |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Treasury stock acquired, shares | 100,000 |  |  |  |
Payments for repurchase of equity | $ 2,400,000 |  |  |  |
Average cost per share (in usd per share) | $ 23.85 |  |  |  |

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- Definition The cash outflow to reacquire common and preferred stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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