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Contract Balances (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Contract with Customer, Asset and Liability [Abstract] |  |  |  |  |  |
Trade accounts receivable, net |  | $ 268,352 | [1] | $ 301,963 | [1] | $ 301,963
Contract assets | [2] | 5,745 |  | 9,823 |  |
Contract liabilities |  | 1,784 | [3] | $ 5,415 | [3] | $ 6,102
Change in Contract with Customer, Asset [Abstract] |  |  |  |  |  |
Contract asset, decrease from beginning of period |  | 4,100 |  |  |  |
Change in Contract with Customer, Liability [Abstract] |  |  |  |  |  |
Contract liability, decrease from beginning of period |  | $ 3,600 |  |  |  |
[1] | Includes billed and unbilled amounts, net of allowance for doubtful accounts. See Note 4 for details.
[2] | Included in the “Prepaid expenses and other current assets” line on the consolidated balance sheet.
[3] | Included in the “Other accrued liabilities” line of the consolidated balance sheet.

X
- Definition Amount due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130533-203044 + Details
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