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Acquisitions (Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 15, 2016 | Nov. 08, 2016 | Sep. 20, 2016 | May 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill | $ 287,956 | $ 275,487 |  |  |  |  | $ 264,416
Houston, Texas And Madera, California [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets |  | 530 |  |  |  |  |
Property, plant & equipment |  | 15,972 |  |  |  |  |
Goodwill |  | 11,832 |  |  |  |  |
Intangible and other non-current assets |  | 4,588 |  |  |  |  |
Assumed liabilities |  | (167) |  |  |  |  |
Purchase Price |  | $ 32,755 |  |  |  |  |
Houston, Texas [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets Acquired (Excluding Goodwill) |  |  |  |  |  | $ 7,000 |
Goodwill |  |  |  |  |  | 3,300 |
Assumed liabilities |  |  |  |  |  | $ (100) |
Madera, California [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets Acquired (Excluding Goodwill) |  |  |  |  | $ 3,700 |  |
Goodwill |  |  |  |  | 1,900 |  |
Assumed liabilities |  |  |  |  | $ 0 |  |
Brooksfield, Wisconsin [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets Acquired (Excluding Goodwill) |  |  |  | $ 5,700 |  |  |
Goodwill |  |  |  | 1,200 |  |  |
Assumed liabilities |  |  |  | $ (100) |  |  |
Colorado And New York [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Current assets | 180 |  |  |  |  |  |
Property, plant & equipment | 12,195 |  |  |  |  |  |
Goodwill | 12,469 |  |  |  |  |  |
Intangible and other non-current assets | 3,309 |  |  |  |  |  |
Assumed liabilities | (63) |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation | (590) |  |  |  |  |  |
Purchase Price | $ 27,500 |  |  |  |  |  |
Burlington/Graham, North Carolina [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets Acquired (Excluding Goodwill) |  |  | $ 4,700 |  |  |  |
Goodwill |  |  | 5,400 |  |  |  |
Assumed liabilities |  |  | $ 0 |  |  |  |

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