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Stock Incentive Plans (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock Options [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock option and Incentive plan, shares authorized | 8,000,000 |  |
Number of Shares Issued or Committed to Issue | 3,480,779 |  |
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based payment, vesting period (years) | 3 years |  |
Summary of Restricted Stock Awards |  |  |
Number of shares, Start Balance | 676,111 | 1,010,127 | 1,548,698
Number of shares, Granted | 323,526 | 365,599 | 308,486
Number of shares, Additional shares from dividends | 1,040 | 8,507 | 18,302
Number of shares, Forfeited | (16,934) | (11,563) | (17,560)
Number of shares, Vested | (400,722) | (696,559) | (847,799)
Number of shares, Ending Balance | 583,021 | 676,111 | 1,010,127
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted-average grant date fair value, Beginning balance (in dollars per share) | $ 10.10 | $ 6.97 | $ 5.49
Weighted-average grant date fair value, Granted (in dollars per share) | $ 9.33 | $ 9.84 | $ 11.54
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) | $ 9.30 | $ 10.07 | $ 9.23
Weighted-average grant date fair value, Forfeited (in dollars per share) | $ 9.65 | $ 10.05 | $ 7.02
Weighted-average grant date fair value, Vested (in dollars per share) | $ 9.94 | $ 5.39 | $ 6.01
Weighted-average grant date fair value, Ending balance (in dollars per share) | $ 9.80 | $ 10.10 | $ 6.97
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |
Expected to vest one year from balance sheet date | 270,440 |  |
Expected to vest two years from balance sheet date | 200,440 |  |
Expected to vest three years from balance sheet date | 104,901 |  |
Expected to vest four years from balance sheet date | 7,240 |  |
Unrecognized compensation cost (in dollars) | $ 3.4 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 22 months |  |
Compensation expense (in dollars) | 3.4 | 3.3 | 3.6
Restricted Stock [Member] | President and Chief Operating Officer [Member] |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |
Accelerated vesting expense | 0.7 |  |
Market Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based payment, vesting period (years) | 3 years |  |
Summary of Restricted Stock Awards |  |  |
Number of shares, Start Balance | 258,842 | 161,575 | 84,854
Number of shares, Granted |  | 89,990 | 72,599
Number of shares, Additional shares from dividends | 6,452 | 7,277 | 4,122
Number of shares, Vested | (90,620) |  |
Number of shares, Ending Balance | 174,674 | 258,842 | 161,575
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted-average grant date fair value, Beginning balance (in dollars per share) | $ 11.31 | $ 11.45 | $ 9.87
Weighted-average grant date fair value, Granted (in dollars per share) |  | $ 11.14 | $ 13.43
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) | $ 10.00 | $ 10.18 | $ 9.23
Weighted-average grant date fair value, Vested (in dollars per share) | $ 9.86 |  |
Weighted-average grant date fair value, Ending balance (in dollars per share) | $ 12.01 | $ 11.31 | $ 11.45
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |
Unrecognized compensation cost (in dollars) | 0.3 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 13 months |  |
Compensation expense (in dollars) | 0.8 | 0.9 | 0.6
Stock Incentive Plans (Textuals) [Abstract] |  |  |
Number of Trading Days of Average Closing Price of Common Stock on Vesting Date used to Calculate Total Shareholder Return (in days) | 30 |  |
Number Of Trading Days Of Average Closing Price Of Common Stock On Grant Date Used To Calculate Total Stockholder Return (in days) | 30 |  |
Threshold Percentage Of No Payout If Stockholder Return Is Less Then Target Return (as a percent) | 50.00% |  |
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) | 150.00% |  |
Market Stock Units [Member] | President and Chief Operating Officer [Member] |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |
Accelerated vesting expense | 0.2 |  |
Market Stock Units [Member] | March 2011 Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Volatility | 64.00% |  |
Risk-Free Rate | 1.20% |  |
Fair Value Grant Date (in dollars per share) | $ 13.43 |  |
Market Stock Units [Member] | March 2012 Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Volatility | 62.00% |  |
Risk-Free Rate | 0.43% |  |
Fair Value Grant Date (in dollars per share) | $ 11.14 |  |
Performance Stock Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share based payment, vesting period (years) | 3 years |  |
Summary of Restricted Stock Awards |  |  |
Number of shares, Start Balance | 0 |  |
Number of shares, Granted | 217,949 |  |
Number of shares, Additional shares from dividends | 5,227 |  |
Number of shares, Vested | 0 |  |
Number of shares, Ending Balance | 223,176 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |
Weighted-average grant date fair value, Beginning balance (in dollars per share) | $ 0.00 |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 9.64 |  |
Weighted-average grant date fair value, Additional shares from dividends (in dollars per share) | $ 10.37 |  |
Weighted-average grant date fair value, Vested (in dollars per share) | $ 0.00 |  |
Weighted-average grant date fair value, Ending balance (in dollars per share) | $ 9.66 |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |
Unrecognized compensation cost (in dollars) | 1.5 |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 26 months |  |
Compensation expense (in dollars) | $ 0.6 |  |
Stock Incentive Plans (Textuals) [Abstract] |  |  |
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) | 150.00% |  |
Performance period | 3 years |  |
Performance Stock Units [Member] | March 2013 Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Volatility | 39.20% |  |
Risk-Free Rate | 0.36% |  |
Fair Value Grant Date (in dollars per share) | $ 9.55 |  |
Performance Stock Units [Member] | May 2013 Award [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |
Volatility | 37.90% |  |
Risk-Free Rate | 0.40% |  |
Fair Value Grant Date (in dollars per share) | $ 10.41 |  |

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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 The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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 Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the 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)(2)(iii)(3) -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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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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- 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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -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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