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Commitments, Contingencies and Other Guarantee (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Dec. 22, 2016
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Guarantor Obligations [Line Items] |  |  |  |
Total long-term debt, carrying value | $ 227,704 |  | $ 226,291 |
Goldman Sachs Bank USA | Indirect Guarantee of Indebtedness |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Current carrying value |  |  |  | $ 30,000
Goldman Sachs Bank USA | STIH |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Total long-term debt, carrying value |  |  |  | $ 40,000
STIN | BPO | Discontinued Operations, Disposed of by Sale | STIH | Goldman Sachs Bank USA | Indirect Guarantee of Indebtedness |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Restricted cash, current |  | $ 6,200 |  |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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