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Commitments and Contingencies - Letters of Credit (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Other Commitments [Line Items] |  |
LOC Outstanding | $ 15,505 | $ 12,034
Restricted cash | 13,736 | 728
Restricted cash, long-term | 0 | 10,980
Investment securities, restricted, long-term | 0 | 336
Letter of Credit |  |
Other Commitments [Line Items] |  |
Utilization of LOC Availability | 1,776 | 0
Long-term Debt, Fiscal Year Maturity |  |
Expiration of Letters of Credit - Less than 1 year | 10,855 |
Expiration of Letters of Credit - 1-3 years | 4,650 |
Expiration of Letters of Credit - 4-5 years | 0 |
Expiration of Letters of Credit - After 5 years | 0 |
Contract performance - equipment systems |  |
Other Commitments [Line Items] |  |
LOC Outstanding | 1,855 | 5,556
Restricted cash | 86 | 728
Restricted cash, long-term | 0 | 4,830
Investment securities, restricted, long-term | 0 | 0
Contract performance - equipment systems | Letter of Credit |  |
Other Commitments [Line Items] |  |
Utilization of LOC Availability | 1,776 | 0
Royalty award |  |
Other Commitments [Line Items] |  |
LOC Outstanding | 7,150 | 6,150
Restricted cash | 7,150 | 0
Restricted cash, long-term | 0 | 6,150
Investment securities, restricted, long-term | 0 | 0
Royalty award | Letter of Credit |  |
Other Commitments [Line Items] |  |
Utilization of LOC Availability | 0 | 0
Other |  |
Other Commitments [Line Items] |  |
LOC Outstanding | 6,500 | 328
Restricted cash | 6,500 | 0
Restricted cash, long-term | 0 | 0
Investment securities, restricted, long-term | 0 | 336
Other | Letter of Credit |  |
Other Commitments [Line Items] |  |
Utilization of LOC Availability | $ 0 | $ 0

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: 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 + Details
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