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Acquisitions Business Combinations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |
Goodwill, Acquired During Period | $ 41,308 | $ 9,773 |
Amortization of Intangible Assets | 8,300 | $ 6,300 | $ 6,500
Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred | 95,800 |  |
Goodwill, Acquired During Period | 33,800 |  |
Amortization of Intangible Assets | 2,700 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 11,300 |  |
Minimum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |
Other Acquisitions [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 15,600 |  |
Goodwill, Acquired During Period | 7,500 |  |
Finite-lived Intangible Assets Acquired | $ 9,400 |  |
Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 15 years |  |
Minimum [Member] | Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |  |
Customer Relationships [Member] | Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 43,900 |  |
Technology-Based Intangible Assets [Member] | Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | 2,900 |  |
Other Intangible Assets [Member] | Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 500 |  |
Maximum [Member] | Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 25 years |  |
Trade Names [Member] | Henry Troemner, LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Finite-lived Intangible Assets Acquired | $ 3,400 |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=73531372&loc=d3e2207-128464 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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