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Share-Based Compensation (Narrative) (Details) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended | 48 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Equity Incentive Stock Option Plans [Member] | Dec. 31, 2012 Equity Incentive Stock Option Plans [Member] | Dec. 31, 2011 Equity Incentive Stock Option Plans [Member] | Dec. 31, 2013 Restricted Stock [Member] | Dec. 31, 2012 Restricted Stock [Member] | Dec. 31, 2011 Restricted Stock [Member] | Dec. 31, 2013 ESPP [Member] | Dec. 31, 2012 ESPP [Member] | Dec. 31, 2011 ESPP [Member] | Apr. 12, 2011 ESPP [Member] offering | Feb. 12, 2004 ESPP [Member] offering | Jan. 01, 2000 ESPP [Member] offering | Dec. 31, 2013 SERP [Member] | Dec. 31, 2012 SERP [Member] | Dec. 31, 2011 SERP [Member] | Dec. 31, 2010 SERP [Member] | Dec. 31, 2013 SERP [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 2,607,000 | [1] | $ 2,538,000 | [1] | $ 2,152,000 | [1] |  |  |  | $ 28,000 | $ 0 | $ 0 | $ 562,000 | $ 641,000 | $ 282,000 |  |  |  | $ 538,000 | $ 560,000 | $ 444,000 |  |
Percentage of match participants' deferrals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  | 25.00% |
Common stock reserved for future issuance |  |  |  |  |  |  | 5,277,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum term of grants |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options vested and exercisable, period, in years |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value of stock options granted (in dollars per share) |  |  |  |  |  |  | $ 6.81 | $ 4.74 | $ 3.26 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted during period |  |  |  |  |  |  |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average grant-date fair value of restricted stock granted (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 23.50 |  |  |  |  |  |  |  |  |  |  |  |  |
Period of expense of unrecognized compensation cost, years | 4 years |  | 4 years |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of initial offerings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  |  |
Number of additional offerings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 8 |  |  |  |  |  |
Stock options authorized to issue to employees |  |  |  |  |  |  |  |  |  |  |  |  | 4,050,000 |  |  |  |  |  |  |  |  |  |
Shares available for future grant |  |  |  |  |  |  | 2,793,000 |  |  |  |  |  | 2,476,000 |  |  |  |  |  |  |  |  |  |
Annual earnings withheld to purchase common stock |  |  |  |  |  |  |  |  |  |  |  |  | 21,250 |  |  |  |  |  |  |  |  |  |
Percent of IRS limitation |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |
Maximum fair value of common stock purchased |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |
Percentage of stock purchase price |  |  |  |  |  |  |  |  |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |  |
Percentage of earned income on a pre-tax basis, deferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |
Percentage of deferral in the form of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |
Stock options authorized to issue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,013,000 |  |  |  | 1,013,000
Common stock reserved for future issuance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 452,000 |  |  |  | 452,000
Shares exercised and delivered |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,000 |  |  |  | 19,000
Shares issued to trustee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560,000
Stock options vested and outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 311,000 |  |  |  | 311,000
[1] | Stock-based compensation expense is recorded in the selling, general and administrative caption in our consolidated statements of comprehensive income.

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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