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Stock-Based Compensation (Stock Option Activity) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Number of Stock Options Outstanding |  |  |
Outstanding, Options, Beginning Balance | 153,418 |  |
Granted, Options | 27,000 | 37,500 | 30,500
Exercised, Options | (16,361) | (45,154) | (78,035)
Cancelled, Options | (7,388) |  |
Outstanding, Options, Ending Balance | 156,669 | 153,418 |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price, Beginning Balance | $ 30.31 |  |
Granted, Weighted Average Exercise Price | $ 36.75 |  |
Exercised, Weighted Average Exercise Price | $ 27.72 |  |
Cancelled, Weighted Average Exercise Price | $ 29.74 |  |
Weighted Average Exercise Price, Ending Balance | $ 31.72 | $ 30.31 |
Vested and Expected to Vest |  |  |
Vested and expected to vest, Outstanding | 149,084 |  |
Vested and expected to vest, Weighted Average Exercise Price | $ 31.91 |  |
Vested and Expected to Vest, Weighted Average Intrinsic Value | $ 5.60 |  |
Vested and expected to vest, Aggregate Intrinsic Value | $ 1,206 |  |
Exercisable, Outstanding | 63,090 |  |
Exercisable, Weighted Average Exercise Price | $ 30.28 |  |
Exercisable, Weighted Average Intrinsic Value | $ 5.38 |  |
Exercisable, Aggregate Intrinsic Value | 613 |  |
Additional Disclosures |  |  |
Outstanding, Weighted Average Intrinsic Value | $ 5.56 |  |
Outstanding, Options, Aggregate Intrinsic Value | $ 1,296 |  |
Minimum [Member] |  |  |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price, Beginning Balance | $ 18.37 |  |
Granted, Weighted Average Exercise Price | $ 35.46 |  |
Exercised, Weighted Average Exercise Price | $ 18.37 |  |
Cancelled, Weighted Average Exercise Price | $ 26.99 |  |
Weighted Average Exercise Price, Ending Balance | $ 21.82 |  |
Vested and Expected to Vest |  |  |
Vested and expected to vest, Weighted Average Exercise Price | $ 21.82 |  |
Exercisable, Weighted Average Exercise Price | $ 21.82 |  |
Maximum [Member] |  |  |
Weighted Average Exercise Price |  |  |
Weighted Average Exercise Price, Beginning Balance | $ 37.60 |  |
Granted, Weighted Average Exercise Price | $ 40.62 |  |
Exercised, Weighted Average Exercise Price | $ 37.60 |  |
Cancelled, Weighted Average Exercise Price | $ 36.75 |  |
Weighted Average Exercise Price, Ending Balance | $ 40.62 |  |
Vested and Expected to Vest |  |  |
Vested and expected to vest, Weighted Average Exercise Price | $ 40.62 |  |
Exercisable, Weighted Average Exercise Price | $ 37.60 |  |

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable. + 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 (e)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph d(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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