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Stock Compensation (Narrative) (Details) shares in Thousands, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) item shares	Mar. 31, 2018 USD ($) shares	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance stock unit grants | item	2
Capitalized stock compensation expense	$ 132	$ 106
ESPP Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP, percentage of market price for eligible employees	85.00%
Employees purchased common stock, shares | shares	24	36
RSAs, RSUs, And PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized awards from approved stock incentive plans | shares	453	273
Aggregate grant date market value	$ 13,400	$ 5,900
Unrecognized compensation costs	18,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 3,400
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	2 years 2 months 12 days
Restricted Stock Awards (RSAs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	1 year 7 months 6 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	1 year 10 months 24 days
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units			80.00%
Expected weighted-average period for recognizing the unrecognized compensation costs, in years	3 years 1 month 6 days
Maximum [Member] | Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units			150.00%
Maximum [Member] | Short-term PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units	150.00%
Maximum [Member] | Long-term PSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target number of shares of common stock granted as Performance Stock Units	288.00%
Officers [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants of stock options | shares	169	219

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