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v3.6.0.2

Textuals (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined Benefit Plan, Pension, Vested Percentage |  | 100.00% |  |
Defined contribution plan, employer discretionary contribution amount |  |  |  | $ 9,700,000
Defined contribution plan, cost recognized |  | $ 18,500,000 | $ 18,100,000 | $ 28,300,000
Deferred Compensation Liability, Classified, Noncurrent |  | 21,700,000 | 23,500,000 |
Defined Benefit Plan, Contributions by Plan Participants |  | $ 709,000 | $ 735,000 |
United States |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined contribution plan, employer matching contribution, percent |  | 50.00% |  |
Defined contribution plan, maximum annual contribution per employee, percent |  | 6.00% |  |
Canada |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined Benefit Plan, Contributions by Plan Participants |  | $ 0.02 |  |
Canada | Minimum |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined contribution plan, employer matching contribution, percent |  | 3.00% |  |
Canada | Maximum |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined contribution plan, employer matching contribution, percent |  | 5.00% |  |
Canada | Supplemental Employee Retirement Plan [Member] |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined Benefit Plan, Pension, Vested Percentage |  | 100.00% |  |
Defined Benefit Plan, Contributions by Plan Participants |  | $ 0.04 |  |
Scenario, Forecast [Member] |  |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 400,000 |  |  |

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- Definition The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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