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Acquisitions (Purchase Price Allocation) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 28, 2015 | Dec. 31, 2014 | May 01, 2014
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Business Acquisition [Line Items] |  |  |  |  |
Non-tax-deductible goodwill | $ 652,743 | $ 669,036 |  | $ 798,481 |
J-Mac Tool, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash acquired |  |  | $ 36,174 |  |
Property and equipment |  |  | 11,506 |  |
Intangible assets (primarily customer relationships) |  |  | 10,400 |  |
Tax-deductible goodwill |  |  | 13,977 |  |
Current liabilities |  |  | (10,129) |  |
Long term liabilities |  |  | (22) |  |
Net assets acquired |  |  | $ 61,900 |  |
Quality Wireline and Cable, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets, net of cash acquired |  |  |  |  | $ 7,596
Property and equipment |  |  |  |  | 3,837
Intangible assets (primarily customer relationships) |  |  |  |  | 11,527
Non-tax-deductible goodwill |  |  |  |  | 20,573
Current liabilities |  |  |  |  | (1,615)
Deferred tax liabilities |  |  |  |  | (3,629)
Net assets acquired |  |  |  |  | $ 38,289

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