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Exit and Disposal Costs (Details) - USD ($) $ in Thousands | 12 Months Ended | 18 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Business Exit Costs |  | $ 5,100 |  |
Contractual Obligation | [1] | 1,058,103 |  |
Scenario, Forecast [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Business Exit Costs |  |  |  | $ 7,600
Office Space Leases [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Gain (Loss) on Contract Termination |  | 3,200 |  |
Contractual Obligation |  | 50,100 |  |
Mid Continent Divestiture 2015 [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Business Exit Costs |  |  | $ 9,300 |
Mid Continent Divestiture 2015 [Member] | Office Space Leases [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Contractual Obligation |  | $ 3,800 |  |
[1] | During the third quarter of 2015, the Company closed its office in Tulsa, Oklahoma. These amounts include lease payments for the Tulsa office, net of sublease income. The Company expects to receive $2.7 million of total sublease income through 2019.

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 4: 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=66902209&loc=d3e3602-108585 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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