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Revenue from Contracts with Customers Contract Assets and Liabilities (Tables) | 6 Months Ended
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Jun. 30, 2018
Revenue from Contract with Customer [Abstract] |
Deferred Revenue Disclosure [Text Block] |
| June 30, 2018
| (In Thousands)
Unearned Income, beginning of period | $ | 17,050 |
Additional unearned income | 59,360 |
Revenue recognized | (47,276 | )
Unearned income, end of period | $ | 29,134 |

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- Definition The entire disclosure for deferred revenues at the end of the reporting period, and description and amounts of significant changes that occurred during the reporting period. Deferred revenue is a liability as of the balance sheet date related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 430 -URI http://asc.fasb.org/topic&trid=2122452 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenueFromContractWithCustomerAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration