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Compensation Plans - Schedule of Various Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 3,400 | $ 3,400 | $ 3,600
Weighted average fair value (usd per share) | $ 40,720 | $ 25,260 |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 898 | $ 850 | 725
Total fair value at vesting date | 1,471 | 2,275 | 809
Total unrecognized compensation cost for nonvested stock units | $ 837 | $ 1,084 | $ 942
Expected years to recognize unearned compensation | 1 year 9 months | 1 year 7 months | 1 year 8 months
Stock Options and SSARs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 0 | $ 0 | $ 50
Intrinsic value of option exercises on date of exercise | 3,156 | 1,156 | 74
Cash received from the exercise of stock options | 91 | 87 | 126
Stock Plan for Non-Management Directors |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation expense | $ 397 | $ 407 | $ 373
Number of shares issued | 10,531,000 | 12,528,000 | 16,283,000
Weighted average fair value (usd per share) | $ 42.46 | $ 31.25 | $ 24.43

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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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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=96867065&loc=d3e5047-113901 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=96867065&loc=d3e5070-113901 + Details
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