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Share Capital - Textual (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2003 shares | Jun. 01, 2011 shares | Jun. 02, 2009 shares | May 30, 2008 shares | May 26, 2005 shares
Share Capital [Line Items] |  |  |  |  |  |  |  |
Compensation cost not yet recognized | $ | $ 0 |  |  |  |  |  |  |
Options, outstanding, intrinsic value | $ | 27,000 |  |  |  |  |  |  |
Options, exercises in period, intrinsic value | $ | $ 471,000 | $ 471,000 | $ 0 |  |  |  |  |
Options, outstanding, weighted average remaining contractual term | 6 months |  |  |  |  |  |  |
Options, vested, weighted average remaining contractual term | 6 months |  |  |  |  |  |  |
Reserved shares | 2,753,496 |  |  |  |  |  |  |
Stock Incentive Plan 2003 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Vested percentage on date of grant |  |  |  | 20.00% |  |  |  |
Vested percentage on each anniversary date |  |  |  | 20.00% |  |  |  |
Vested percentage on each of first two years |  |  |  | 20.00% |  |  |  |
Stock Incentive Plan Maxxcom Privatization [Member] |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 802,440 |  |  |  |
Employee Stock Incentive Plan |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Proceeds from exercise of options | $ | $ 0 | $ 224,000 | $ 0 |  |  |  |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 0 | 0 | 0 |  |  |  |  |
Employee Stock Option | Stock Incentive Plan 2005 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  | 6,750,000 |  | 3,000,000
Employee Stock Option | Stock Incentive Plan 2005 | Additional Authorized On June 2007 And 2009 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  | 3,750,000 |  |
Employee Stock Option | Stock Incentive Plan 2003 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  | 2,836,179 |  |  |  |
Employee Stock Option | Stock Incentive Plan 2003 | Tranche 1 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Expiration period (years) |  |  |  | 5 years |  |  |  |
Employee Stock Option | Stock Incentive Plan 2003 | Tranche 2 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Expiration period (years) |  |  |  | 10 years |  |  |  |
Employee Stock Option | Key Partner Incentive Plan 2008 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  |  |  | 900,000 |
Employee Stock Option | Stock Incentive Plan 2011 |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of shares authorized |  |  |  |  | 3,000,000 |  |  |
Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Expiration period (years) | 3 years |  |  |  |  |  |  |
Award vesting period (years) | 3 years |  |  |  |  |  |  |
Equity instruments other than options, vested in period, fair value | $ | $ 6,272,000 | $ 5,394,000 | $ 7,659,000 |  |  |  |  |
Tax benefit from compensation expense | $ | 5,429,000 | $ 4,678,000 | $ 11,874,000 |  |  |  |  |
Restricted stock and restricted unit awards, fair value | $ | 5,441,000 |  |  |  |  |  |  |
Nonvested awards, compensation not yet recognized, share-based awards other than options | $ | $ 7,105,000 |  |  |  |  |  |  |
Number of shares available for grant (in shares) | 1,934,861 |  |  |  |  |  |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of shares available for grant (in shares) | 781,135 |  |  |  |  |  |  |
Time Based Awards | Employee Stock Option |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 380,367 | 297,794 | 264,478 |  |  |  |  |
Time Based Awards | Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Equity instruments other than options, outstanding, weighted average remaining contractual terms | 1 year 7 months 24 days |  |  |  |  |  |  |
Performance Shares | Employee Stock Option |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number | 17,963 | 68,067 | 497,214 |  |  |  |  |
Performance Shares | Restricted Stock And Restricted Stock Units |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Equity instruments other than options, outstanding, weighted average remaining contractual terms | 1 year 10 months 13 days |  |  |  |  |  |  |
Common Class A |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of votes per share | 1 |  |  |  |  |  |  |
Common Class B |  |  |  |  |  |  |  |
Share Capital [Line Items] |  |  |  |  |  |  |  |
Number of votes per share | 20 |  |  |  |  |  |  |

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- Definition Unrecognized cost of unvested 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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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- 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -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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- 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. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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