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Stock-Based Compensation (Stock Appreciation Rights Award Activity) (Details) (Stock Appreciation Rights (SARs) [Member], USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Appreciation Rights (SARs) [Member] |  |  |
SARs Activity [Roll Forward] |  |  |
Outstanding, Beginning | 389,686 | 320,336 | 222,096
Granted | 132,566 | 145,018 | 126,048
Exercised | (147,148) | (75,668) | (15,370)
Forfeited | 0 | 0 | (12,438)
Outstanding, Ending | 375,104 | 389,686 | 320,336
SARs, Weighted Average Exercise Price [Roll Forward] |  |  |
Oustanding, Beginning (in usd per share) | $ 20.81 | $ 20.17 | $ 19.87
Granted (in usd per share) | $ 29.56 | $ 21.22 | $ 20.57
Exercised (in usd per share) | $ 20.47 | $ 18.91 | $ 19.58
Forfeited (in usd per share) | $ 0.00 | $ 0.00 | $ 19.59
Oustanding, Ending (in usd per share) | $ 24.03 | $ 20.81 | $ 20.17
SARs, Additional Disclosures |  |  |
Exercisable | 56,938 | 110,292 | 117,800
Exercisable (in usd per share) | $ 20.95 | $ 20.70 | $ 19.86

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- Definition Number of non-option equity instruments exercised by participants. + 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 (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event. + 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Net number of non-option equity instruments granted to participants. + 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 (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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