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Employee Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
401(k) |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer matching contribution percent | 100.00% |  |
Employer matching percent | 6.00% |  |
Employer contributions | $ 4,957 | $ 3,832 | $ 4,600
GPPP | United Kingdom goodwill amortization |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer matching contribution percent | 100.00% |  |
Employer matching percent | 6.00% |  |
Employer contributions | $ 161 | 344 | 202
RRSP | Canada |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Employer matching contribution percent | 100.00% |  |
Employer matching percent | 6.00% |  |
Employer contributions | $ 351 | $ 774 | $ 307

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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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