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Investment in unconsolidated subsidiary | 12 Months Ended
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Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract] |
Investment in unconsolidated subsidiary | Investment in unconsolidated subsidiary Effective July 1, 2013, the Company jointly purchased Global Tubing, LLC ("Global Tubing") with an equal partner, with Global Tubing's management retaining a small interest. Global Tubing is a Dayton, Texas based provider of coiled tubing strings and related services. The Company's equity investment is reported in the Completions segment and is accounted for using the equity method of accounting. As Global Tubing's products are complementary to the Company’s well intervention and stimulation products and the investment's business is integral to the Company's operations, the earnings from the equity investment are included within operating income (loss). Condensed financial data for the equity investment in the unconsolidated subsidiary is summarized as follows:
| December 31, 2016 |  | December 31, 2015
Current assets | $ | 48,194 |  |  | $ | 56,160 |
Long-term assets | 142,682 |  |  | 145,965 |
Current liabilities | 11,918 |  |  | 10,861 |
Long-term liabilities | 80,500 |  |  | 95,000 |
| Year ended December 31,
| 2016 |  | 2015
Net revenues | $ | 71,473 |  |  | $ | 103,532 |
Gross profit | 16,899 |  |  | 45,333 |
Net income | 3,795 |  |  | 30,888 |
The Company's earnings from equity investment | 1,824 |  |  | 14,824 |
Subsequent to December 31, 2016, the Company contributed $1.0 million to Global Tubing, LLC.

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- Definition The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=64825282&loc=d3e32847-111569 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 35 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=64825282&loc=d3e32787-111569 + Details
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