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Intangible Assets and Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Finite-Lived Intangible Assets [Table Text Block] | Finite-lived intangible assets represented customer relationships and consisted of the following at December 31:
in thousands |  |  |  |  |  | 2016 |  |  | 2015 |
Cost |  |  |  |  |  | $ | 6,300 |  |  | $ | 23,811 |
Accumulated amortization |  |  |  |  |  | (4,630 | ) |  | (21,116 | )
Carrying value |  |  |  |  |  | $ | 1,670 |  |  | $ | 2,695 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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