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Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2018
Revenues [Abstract] |
Contract with Customer, Asset and Liability [Table Text Block] | A summary of significant net changes in the contract assets and the contract liabilities balances during the period is as follows:
| 2018
| Contract liabilities, less contract assets
| (in thousands)
Beginning balance, January 1 | $ | 59,808 |
Changes due to business combination | 38,816 |
Revenue recognized from beginning contract liability | (24,549 | )
Revenue recognized from current period increases | (6,352 | )
Increases due to amounts collected or due | 56,051 |
Other | (1,243 | )
Ending balance, March 31 | $ | 122,531 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130551-203045 + Details
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- References No definition available. + Details
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