| **Business Combination Goodwill (Tables)**                    | 6 Months Ended                                                                                                                                                                                                   |
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| **Goodwill [Abstract]**                                       |                                                                                                                                                                                                             |
| Schedule of Intangible Assets and Goodwill [Table Text Block] | The following table presents the changes in goodwill: Amount (in thousands)  Balance at December 31, 2016$62,041Purchase price adjustments, net of tax(5,710)Balance at June 30, 2017$56,331 |

| X                                                                                                                                                                                                                     |
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| - Definition
Goodwill [Abstract]
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267
+ Details**Name:**us-gaap_ScheduleOfIntangibleAssetsAndGoodwillTableTextBlock**Namespace Prefix:**us-gaap_**Data Type:**nonnum:textBlockItemType**Balance Type:**na**Period Type:**duration |