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Stock-Based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other information |  |  |  |
Allocated Share-based Compensation Expense | $ 4.8 | $ 4.7 | $ 3.5 |
Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercisable period from date of grant | 10 years |  |  |
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | $ 0.1 |  |  |
Weighted average vesting period | 2 months 12 days |  |  |
Maximum [Member] | Stock Option [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 4 years |  |  |
Minimum [Member] | Stock Option [Member] |  |  |  |
Assumptions used in determining the fair value of stock options granted for fixed awards with graded vesting schedules |  |  |  |
Vesting period | 3 years |  |  |
Long-Term Incentive Plan [Member] |  |  |  |
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | $ 5.7 |  |  |
Long-Term Incentive Plan [Member] | Maximum [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum Grants Of Awards (in shares) | 4,000,000 |  |  |
Phantom Stock [Member] |  |  |  |
Other information |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 3,804 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 29.57 |  |  |
Total Shareholder Return [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 47.24 |  |  |
Total Shareholder Return [Member] | Performance Period Prior To January 01 2015 [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Period | 20 days |  |  |
Total Shareholder Return [Member] | Prior to December 31 2017 [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Performance Period | 20 days |  |  |
Return On Invested Capital [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 30.16 |  |  |
Restricted Stock [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 24.48 | $ 22.64 | $ 21.33 | $ 19.54
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | $ 2.9 |  |  |
Weighted average vesting period | 1 year 7 months 6 days |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 83,236 | 82,351 | 76,590 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 29.21 | $ 24.46 | $ 24.48 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 198,145 | 220,337 | 211,716 | 185,764
Performance awards [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Shares earned by the participants | 40,474 | 65,237 | 45,116 |
Target awards earned during the performance period (as a percent) | 91.40% | 163.30% | 133.30% |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ 32.68 | $ 26.63 | $ 21.29 | $ 20.51
Other information |  |  |  |
Total unrecognized stock-based compensation expense, net of estimated forfeitures | $ 2.7 |  |  |
Weighted average vesting period | 1 year 6 months |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | 69,978 | 85,078 | 46,106 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 38.70 | $ 27.69 | $ 24.68 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 143,608 | 126,803 | 87,194 | 74,923
Performance awards [Member] | Maximum [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Potential Payout As a Percentage of Target Shares | 200.00% |  |  |
Other information |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 143,608 |  |  |
Performance awards [Member] | Minimum [Member] |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |
Potential Payout As a Percentage of Target Shares | 0.00% |  |  |

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- Definition Represents the performance period of other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References No definition available. + Details
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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=6415400&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=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 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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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