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

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

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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.

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- References

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth and fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second and third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale which are intended to be held for greater than one year or the normal operating cycle, whichever is longer and that are pledged to one or more secured parties who have the right to buy, sell, or re-pledge the collateral.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations.

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Cash and equivalents whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements.

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