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Revenue from Contracts with Customers Revenue from Contracts with Customers - By Geographic Location (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue from external customers by geographic areas [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 255,993 | $ 272,796 | $ 519,845 | $ 546,297
Domestic |  |  |  |  |
Revenue from external customers by geographic areas [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 248,872 |  | 504,964 |
Foreign [Member] |  |  |  |  |
Revenue from external customers by geographic areas [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | [1] | $ 7,121 |  | $ 14,881 |
[1] | This represents revenue earned by non-U.S. domiciled subsidiaries.

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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