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Debt and Line of Credit (Details) $ in Thousands |  |  |  |  |  |  | 12 Months Ended | 27 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 07, 2017 USD ($) | Jul. 02, 2014 USD ($) covenant | Jul. 01, 2014 | Dec. 30, 2013 USD ($) satellite_hub | Jan. 30, 2013 USD ($) satellite_hub | Jun. 09, 2011 | Dec. 31, 2017 USD ($) financial_covenants | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jul. 01, 2019 USD ($) | Apr. 06, 2009 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total outstanding at December 31 |  |  |  |  |  |  | $ 47,054 | $ 58,053 |  |  |
Repayments of Long-term loan |  |  |  |  |  |  | 9,350 | 5,281 | $ 4,876 |  |
Long-term Debt, Current Maturities |  |  |  |  |  |  | 2,482 | 7,900 |  |  |
Long-term Debt, Excluding Current Maturities |  |  |  |  |  |  | 44,572 | 50,153 |  |  |
Line of credit | Term loan |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total outstanding at December 31 |  |  |  |  |  |  | $ 44,275 | 53,625 |  |  |
Mortgages |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  | $ 4,000
Debt instrument, maturity term |  |  |  |  |  |  | 10 years |  |  |  |
Debt instrument, principal amortization term |  |  |  |  |  |  | 20 years |  |  |  |
Monthly repayments of long-term debt, principal and interest |  |  |  |  |  |  | $ 0 |  |  |  |
Annual increase in repayments of long-term debt, principal and interest |  |  |  |  |  |  | 0 |  |  |  |
Thereafter |  |  |  |  |  |  | $ 2,551 |  |  |  |
Number of financial covenants | financial_covenants |  |  |  |  |  |  | 1 |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total outstanding at December 31 |  |  |  |  |  |  | $ 2,779 | 2,951 |  |  |
Mortgages | Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, restrictive covenant, fixed charge coverage ratio, amount |  |  |  |  |  |  | 25,000 |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 1,200 | $ 4,700 |  |  |  |  |  |
Debt instrument, maturity term |  |  |  | 5 years | 5 years |  |  |  |  |  |
Number of satellite hubs pledged as collateral | satellite_hub |  |  |  | 1 | 6 |  |  |  |  |  |
Debt instrument, fixed interest rate |  |  |  | 3.08% | 2.76% |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total outstanding at December 31 |  |  |  |  |  |  | 0 | $ 1,477 |  |  |
Senior Credit Facility | Line of credit | Line of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Term |  |  | 5 years |  |  |  |  |  |  |  |
Number of financial covenants | covenant |  | 2 |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | $ 80,000 |  |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  | 250 |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  | $ 30,000 |  |  |  |  |  |  |  |  |
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Dispositions Not Reinvested, Percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Stated Equity Issuance, Percentage |  | 50.00% |  |  |  |  |  |  |  |  |
Line of Credit Facility, Mandatory Prepayment Provision, Net Cash Proceeds from Receipts Greater than 250 Thousand Dollars, Non-ordinary Business, Percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Consolidated Leverage Ratio |  |  | 1.50 |  |  |  |  |  |  |  |
Senior Credit Facility | Line of credit | Revolving loan agreement |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | $ 15,000 |  |  |  |  | $ 15,000 |  |  |  |
Senior Credit Facility | Line of credit | Term loan |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | $ 65,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Security Interest Pledged, Percentage |  |  | 65.00% |  |  |  |  |  |  |  |
Senior Credit Facility | Line of credit | Base Rate | Maximum | Line of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 2.25% |  |  |  |  |  |  |  |
Senior Credit Facility | Line of credit | Base Rate | Minimum | Line of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  | 1.75% |  |  |  |  |  |  |  |
Mortgage Loan On Headquarters Facility | Mortgages | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  |  |  |  |  | 2.00% |  |  |  |  |
Debt Instrument, Redemption, Period One | Senior Credit Facility | Line of credit | Term loan |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Repayments of Long-term loan | $ 6,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Six | Senior Credit Facility | Line of credit | Line of credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Leverage Ratio |  |  |  |  |  |  |  | 1.50 |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Covenant Compliance, Maximum Consolidated Fixed Charge Coverage Ratio |  |  |  |  |  |  | 1.25 |  |  |  |
Subsequent Event [Member] | Debt Instrument, Redemption, Period Three [Member] | Senior Credit Facility | Line of credit | Term loan |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fiscal Year Maturity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 575 |

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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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