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Basis of Presentation and Significant Accounting Policies - Additional Information (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) country | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Basis of Presentation and Accounting Policies [Line Items] |  |  |  |
Award requisite service period (years) |  | 2 years |  |
Prior period reclassification adjustment | $ 7,500,000 |  |  |
Goodwill impairment |  | $ 0 | $ 0 | $ 0
Goodwill |  | $ 25,210,000 | 14,163,000 |
Number of countries in which entity operates | country |  | 60 |  |
Amortization expense for intangible assets |  | $ 1,800,000 | 700,000 | 800,000
Marketable securities, realized gains (losses) |  | (700,000) | 1,400,000 | $ 3,900,000
Deferred revenue |  | 57,600,000 | $ 76,100,000 |
U.S. Services |  |  |  |
Basis of Presentation and Accounting Policies [Line Items] |  |  |  |
Goodwill |  | 16,300,000 |  |
Tubular Sales Segment |  |  |  |
Basis of Presentation and Accounting Policies [Line Items] |  |  |  |
Goodwill |  | $ 2,400,000 |  |

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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=56944662&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=26713463&loc=d3e16323-109275 + Details
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