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Revenue Recognition (Contract Balances) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Trade accounts receivable, net
Balance, January 1, 2019	$ 20,817
Balance, March 31, 2019	19,341
Increase (decrease) in accounts receivable	(1,476)
Contract liability (current)
Balance, January 1, 2019	754
Balance, March 31, 2019	718
Increase (decrease) in contract liability (current)	(36)
Contract liability (long-term)
Balance, January 1, 2019	2,008
Balance, March 31, 2019	1,832
Increase (decrease) in contract liability (long-term)	$ (176)

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- Definition

Change in Contract with Customer, Asset [Roll Forward]

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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.

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