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TOPIC 606 ADOPTION IMPACT AND REVENUE FROM CONTRACTS WITH CUSTOMERS: Narrative (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Apr. 01, 2018 | Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ 638,043,000 |  | $ 628,331,000
Capitalized contract cost, unamortized | 18,100,000 |  |
Capitalized contract cost, net | 2,900,000 |  |
Contract with customer, asset, credit loss expense | 0 |  |
ASC 606 Adjustments | Accounting Standards Update 2014-09 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Retained earnings | $ (14,611,000) | $ 12,700,000 |
Minimum |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Capitalized contract cost amortization period | 2 years |  |
Maximum |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Capitalized contract cost amortization period | 5 years |  |

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