Long-Lived Assets (Intangible Assets) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment item	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Long-Lived Assets
Amortization expense	$ 300	$ 400
Subject to amortization
Gross Carrying Value	22,029		$ 22,029
Accumulated Amortization	18,630		18,303
Net Carrying Value	3,399		3,726
Not subject to amortization
Carrying Value	27,300		27,300
Total intangible assets
Gross Carrying Value	49,329		49,329
Accumulated Amortization	18,630		18,303
Net Carrying Value	30,699		31,026
Goodwill	$ 12,104		12,104
Number of reportable segments | segment	1
Number of reporting units | item	1
Estimated amortization expense
2018 (remaining months)	$ 980
2019	930
2020	574
2021	270
2022	223
Thereafter	422
Net Carrying Value	3,399		3,726
Brand name
Not subject to amortization
Carrying Value	27,300		27,300
Customer relationships
Subject to amortization
Gross Carrying Value	21,709		21,709
Accumulated Amortization	18,310		17,983
Net Carrying Value	3,399		3,726
Total intangible assets
Accumulated Amortization	18,310		17,983
Estimated amortization expense
Net Carrying Value	3,399		3,726
Trade name and other
Subject to amortization
Gross Carrying Value	320		320
Accumulated Amortization	320		320
Total intangible assets
Accumulated Amortization	$ 320		$ 320