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Business Combinations (Details) - Business Combination Contingent Consideration by Earnout Target Period [Domain] - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Feb. 28, 2015 | Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Business combinations |  |  |  |  |  |
Operating income |  | $ 7,949 | $ 27,981 | $ 12,194 | $ 48,026 |
Goodwill |  | 124,562 |  | 124,562 |  | $ 119,410
Aevenia |  |  |  |  |  |
Business combinations |  |  |  |  |  |
Fair value of consideration | $ 22,700 |  |  |  |  |
Cash payment made | 22,300 |  |  |  |  |
Payable to sellers | $ 400 |  |  |  |  |
Current assets |  | 4,200 |  | 4,200 |  |
Current liabilities |  | 2,100 |  | 2,100 |  |
Plant and equipment |  | 11,200 |  | 11,200 |  |
Intangibles assets |  | 3,850 |  | 3,850 |  |
Goodwill |  | 5,150 |  | $ 5,150 |  |
Goodwill and other intangible assets deductible for income tax purposes | 15 years |  |  |  |  |
Business Combination Adjustments |  |  |  |  |  |
Increase to current assets |  | 200 |  |  |  |
Decrease to current liabilities |  | (200) |  |  |  |
Increase to intangible assets |  | 3,850 |  |  |  |
Decrease to goodwill |  | $ (4,200) |  |  |  |
Aevenia | Customer relationships |  |  |  |  |  |
Business combinations |  |  |  |  |  |
Intangibles assets | $ 2,500 |  |  |  |  |
Aevenia | Non-compete agreements |  |  |  |  |  |
Business combinations |  |  |  |  |  |
Intangibles assets | $ 1,350 |  |  |  |  |

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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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