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Revenue Recognition (Contract Balances) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Trade accounts receivable, net
Balance, January 1, 2019	$ 20,817
Balance, June 30, 2019	19,043
Increase (decrease) in accounts receivable	(1,774)
Contract liability (current)
Balance, January 1, 2019	754
Balance, June 30, 2019	706
Increase (decrease) in contract liability (current)	(48)
Contract liability (long-term)
Balance, January 1, 2019	2,008
Balance, June 30, 2019	1,660
Increase (decrease) in contract liability (long-term)	$ (348)

X

- Definition

Change in Contract with Customer, Asset [Roll Forward]

+ References

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Change in Contract with Customer, Current Liability [Roll Forward]

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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://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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