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Segment and Geographical Information - Long Lived Assets and Continuing Operations by Country (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |
Revenues | $ 467,815 | $ 413,696 | $ 927,737 | $ 818,860 |
Income (loss) before income taxes | 113,765 | 96,389 | 196,727 | 171,230 |
Long-lived assets | 26,668 |  | 26,668 |  | $ 28,099
United States [Member] |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |
Revenues | 395,710 | 349,388 | 779,504 | 689,182 |
Income (loss) before income taxes | 94,100 | 77,511 | 157,314 | 135,543 |
Long-lived assets | 26,122 |  | 26,122 |  | 27,443
Canada [Member] |  |  |  |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |  |  |  |
Revenues | 72,105 | 64,308 | 148,233 | 129,678 |
Income (loss) before income taxes | 19,665 | $ 18,878 | 39,413 | $ 35,687 |
Long-lived assets | $ 546 |  | $ 546 |  | $ 656

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=114873790&loc=SL114874131-224263 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22694-107794 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260 + Details
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