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Capital Stock - Additional Information, Stock-based compensation (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) time $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 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 | $ 3.60 | $ 7.74 | $ 11.50
Common stock conversion (in shares) | shares | 1 |  |
Stock Option [Member] |  |  |
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 | 4,780,371 | 4,527,282 |
Stock options granted (in shares) | shares | 916,015 | 265,135 | 15,243
Stock option, term | 10 years |  |
Vesting period | 3 years |  |
Unrecognized compensation cost related to non-vested stock options granted under the Plans | $ 1,200,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2017 | 600,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2018 | 500,000 |  |
Expected recognition of compensation related to non-vested stock options granted under the Plans in 2019 | 100,000 |  |
Compensation costs | 1,500,000 | $ 1,700,000 | $ 1,000,000
Intrinsic value of options exercised | 0 | 500,000 | $ 22,600,000
Intrinsic value of outstanding in-the-money stock options | $ 0 | $ 0 |
Weighted-average remaining life of options vested and expected to vest | 4 years 6 months | 3 years 4 months 24 days |
Weighted-average grant-date fair value of options granted (dollars per share) | $ / shares | $ 3.60 | $ 7.74 | $ 11.50
Expected volatility used in computing fair value of options granted | 55.10% | 31.10% | 34.70%
Expected life used in computing fair value of options granted, years | 6 years | 5 years | 5 years
Dividend yield used in computing fair value of options granted | 3.20% | 4.40% | 4.40%
Risk-free interest rate used in computing fair value of options granted | 1.30% | 1.40% | 1.60%
Estimated forfeiture rate used in computing fair value of options granted | 7.00% | 8.00% | 12.00%
Period of historical data used to calculate expected volatility in years | 5 years |  |
Stock Option [Member] | Nonvested [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average grant date fair value of non-vested options forfeited | $ 0 | $ 0 | $ 100,000
Restricted stock units [Member] |  |  |
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 | 238,609 | 63,912 | 81,388
Fair value of granted stock | $ 2,300,000 | $ 2,800,000 | $ 4,600,000
Vested restricted stock (in shares) | shares | 98,844 | 101,419 | 261,911
Market value of vested restricted stock | $ 4,300,000 | $ 4,300,000 | $ 8,500,000
Performance shares [Member] |  |  |
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 | 50,689
Fair value of granted stock | $ 3,600,000 | $ 3,400,000 | $ 3,400,000
Performance shares [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 2 years |  |
Performance shares [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted Stock Units and Performance Share Units [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock granted (in shares) | shares | 59,518 | 98,381 | 149,082
Share based compensation expense | $ 4,200,000 | $ 4,500,000 | $ 7,500,000
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation costs | $ 600,000 | $ 1,000,000 | $ 1,000,000
Number of shares or units granted equity based compensation awards | shares | 67,000 | 22,502 | 18,230

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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 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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