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Capital Stock - Additional Information, Stock-based compensation (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) time $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average grant-date fair value of options granted (dollars per share) | $ / shares | $ 4.71 | $ 3.60 | $ 7.74
Common stock conversion (in shares) | shares | 1 |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock, shares reserved for issuance upon exercise of options or equity awards granted or to be granted | shares | 5,115,308 | 4,780,371 |
Stock options granted (in shares) | shares | 732,314 | 916,015 | 265,135
Stock option, term | 10 years |  |
Vesting period | 3 years |  |
Unrecognized compensation cost related to non-vested stock options granted under the Plans | $ 2,300,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2018 | 1,300,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2019 | 900,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2020 | 100,000 |  |
Compensation costs | 1,700,000 | $ 1,500,000 | $ 1,700,000
Intrinsic value of options exercised | 30,000 | 0 | $ 500,000
Intrinsic value of outstanding in-the-money stock options | $ 0 | $ 0 |
Weighted-average remaining life of options vested and expected to vest | 5 years 1 month | 4 years 6 months |
Weighted-average grant-date fair value of options granted (dollars per share) | $ / shares | $ 4.71 | $ 3.60 | $ 7.74
Expected volatility used in computing fair value of options granted | 62.40% | 55.10% | 31.10%
Expected life used in computing fair value of options granted, years | 6 years | 6 years | 5 years
Dividend yield used in computing fair value of options granted | 2.50% | 3.20% | 4.40%
Risk-free interest rate used in computing fair value of options granted | 2.00% | 1.30% | 1.40%
Estimated forfeiture rate used in computing fair value of options granted | 7.00% | 7.00% | 8.00%
Period of historical data used to calculate expected volatility in years | 5 years |  |
Stock Options | Nonvested |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of non-vested options forfeited | $ 200,000 | $ 0 | $ 0
Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Number of shares or units granted equity based compensation awards | shares | 349,175 | 238,609 | 63,912
Fair value of granted stock | $ 3,600,000 | $ 2,300,000 | $ 2,800,000
Vested restricted stock (in shares) | shares | 129,106 | 98,844 | 101,419
Market value of vested restricted stock | $ 3,200,000 | $ 4,300,000 | $ 4,300,000
Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of times performance units to vest, Minimum | time | 0 |  |
Number of shares or units granted equity based compensation awards | shares |  | 311,691 | 61,774
Fair value of granted stock |  | $ 3,600,000 | $ 3,400,000
Performance Share Units | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted Stock Units and Performance Share Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock granted (in shares) | shares | 73,078 | 59,518 | 98,381
Share based compensation expense | $ 4,000,000 | $ 4,200,000 | $ 4,500,000
Restricted Stock Awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation costs | $ 900,000 | $ 600,000 | $ 1,000,000
Number of shares or units granted equity based compensation awards | shares | 89,387 | 67,000 | 22,502

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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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average expected volatility rate of share-based compensation awards. + 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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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