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Stock Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Common stock, shares issued | 200,741,777 | 199,964,041 |  |
February 2015 Award |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 12.13 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 22.90% |  |  |
Risk-Free Rate | 1.01% |  |  |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based payment, vesting period (years) | 3 years |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 14.48 | $ 12.39 | $ 9.33 |
Unvested shares outstanding | 474,567 | 514,419 | 583,021 | 676,111
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Expected to vest two years from balance sheet date | 241,698 |  |  |
Expected to vest three years from balance sheet date | 153,578 |  |  |
Expected to vest four years from balance sheet date | 79,291 |  |  |
Unrecognized compensation cost (in dollars) | $ 3.7 |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 22 months |  |  |
Compensation expense (in dollars) | $ 2.8 | $ 3.2 | $ 3.4 |
Shares vested during period | 255,828 | 317,376 | 400,722 |
Restricted Stock | President and Chief Operating Officer |  |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Accelerated vesting expense |  | $ 0.3 | $ 0.7 |
Market Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based payment, vesting period (years) | 3 years |  |  |
Unvested shares outstanding | 0 |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Compensation expense (in dollars) | $ 0.1 | $ 0.3 | 0.8 |
Market Stock Units | President and Chief Operating Officer |  |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Accelerated vesting expense |  |  | $ 0.2 |
Market Stock Units | Executive Officer |  |  |  |
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Shares vested during period | 99,047 |  |  |
Common stock, shares issued | 148,572 |  |  |
Performance Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share based payment, vesting period (years) | 3 years |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 12.13 | $ 12.33 | $ 9.64 |
Unvested shares outstanding | 676,359 | 436,170 | 223,176 | 0
Summary of Stock Appreciation Rights and Dividend Equivalent Rights |  |  |  |
Expected to vest one year from balance sheet date | 238,779 |  |  |
Expected to vest two years from balance sheet date | 212,879 |  |  |
Expected to vest three years from balance sheet date | 224,701 |  |  |
Unrecognized compensation cost (in dollars) | $ 3.0 |  |  |
Unrecognized compensation expense related to compensation awards, period for recognition (in months) | 21 months |  |  |
Compensation expense (in dollars) | $ 2.3 | $ 1.4 | $ 0.6 |
Stock Incentive Plans (Textuals) [Abstract] |  |  |  |
Performance period | 3 years |  |  |
Maximum Possible Payout to Executive Officer as a Percentage of the Target Award (as a percent) | 150.00% |  |  |
Performance Stock Units | March 2013 Award |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 9.55 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 39.20% |  |  |
Risk-Free Rate | 0.36% |  |  |
Performance Stock Units | May 2013 Award |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 10.41 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 37.90% |  |  |
Risk-Free Rate | 0.40% |  |  |
Performance Stock Units | March 2014 Award |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 12.77 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 33.50% |  |  |
Risk-Free Rate | 0.66% |  |  |
Performance Stock Units | May 2014 Award |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value, Granted (in dollars per share) | $ 9.88 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] |  |  |  |
Volatility | 33.10% |  |  |
Risk-Free Rate | 0.80% |  |  |
Incentive Plan |  |  |  |
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 | 3,924,735 |  |  |

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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 Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + 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 Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(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 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 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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