Class of Warrant or Right, Number of Days Following a Public Announcement of Beneficial Ownership Acquisition

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- Definition

Class of Warrant or Right, Percent of Market Price Per Common Share

+ References

No definition available.

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- Definition

Class of Warrant or Right, Percent of Outstanding Shares Held before Warrants or Rights Exercisable

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No definition available.

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- Definition

Class of Warrant or Right, Redemption of Warrant or Right, Price per Warrant or Right

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No definition available.

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- Definition

Common Stock, Difference in Dividend Rate

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- Definition

Common Stock, Number of Votes

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Performance Award Target Acheivement, Lower Range, Percentage

+ References

No definition available.

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- Definition

Level of Performance Award Achievement, Target

+ References

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Performance Award Target Acheivement, Upper Range, Percentage

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Treasury Stock, Shares, Acquired

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No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
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- Definition

Face amount or stated value per share of common stock.

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-Name Accounting Standards Codification
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-SubTopic 10
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-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 30
-Article 5

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- Definition

Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

+ 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 (j)
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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

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-Publisher FASB
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-Paragraph 2
-Subparagraph (i)
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- Definition

The cash outflow to reacquire common stock during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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-Name Accounting Standards Codification
-Glossary Financing Activities
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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-Subparagraph (c)(2)(iii)
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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).

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-Publisher FASB
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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.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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-Name Accounting Standards Codification
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- Definition

Percentage of vesting of share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Equity Compensation - Narrative (Details)	12 Months Ended
Equity Compensation - Narrative (Details)	Dec. 31, 2015 USD ($) votes $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	May. 16, 2013 shares	Jul. 19, 2005 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock par value (in dollars per share) \| $ / shares	$ 0.25
Stock option related treasury stock, shares acquired \| shares	7,000	29,000	23,000
Right to purchase series A participating serial preferred purchase price per share \| $ / shares					$ 180.00
Percentage of voting power to be acquired at which point rights become exercisable	30.00%
Percentage of the current market price per common share to be used as denominator of rights used to acquire common stock	50.00%
Number of securities called by each warrant or right \| $ / shares	$ 0.001
Number of days following a public announcement of beneficial ownership acquisition	10 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase of treasury stock	$ 134,000	$ 471,000	$ 532,000
Expiration period	10 years
Unrecognized compensation expense, period for recognition	2 years
Award vesting percentage	25.00%
Weighted-average fair value of options granted \| $ / shares		$ 6.23	$ 5.33
Weighted average remaining contractual term of options outstanding	4 years 3 months	5 years	5 years 9 months
Weighted-average remaining contractual term of options exercisable	4 years
Intrinsic value of exercises in period	$ 1,107,000	$ 101,000	$ 158,000
Intrinsic value of options outstanding	2,562,000
Intrinsic value of options exercisable	1,636,000
Cash received from exercise of stock options	2,413,000	480,000	512,000
Fair value of awards vested in period	$ 1,867,000	$ 3,436,000	$ 3,778,000
Award vesting period	4 years
Restricted stock and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease of shares available for grant due to award activity \| shares	1,110,740
Award vesting period	3 years
Performance shares and performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease of shares available for grant due to award activity \| shares	681,058
Award requisite service period	3 years
Performance achievement level, lower range	0.00%
Performance achievement level, upper range	150.00%
Performance achievement level, target range	100.00%
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized \| shares				4,460,337
Weighted Average \| Performance shares and performance share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense, period for recognition	3 years
Class B Common Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ratio of votes per share of Class B common stock to common stock \| votes	10
Class B common shares dividend rate lower than common shares	10.00%
Cliff Vesting \| Restricted stock and restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years