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 USD ($)	Dec. 30, 2013 USD ($) satellite_hub	Jan. 30, 2013 USD ($) satellite_hub	Jun. 09, 2011	Dec. 31, 2016 USD ($) financial_covenants	Dec. 31, 2015 USD ($) satellite_hub	Dec. 31, 2014 USD ($)	Jul. 01, 2019 USD ($)	Mar. 31, 2016	Sep. 30, 2015	Jun. 30, 2015	Apr. 06, 2009 USD ($)
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis							.0218
Long-term Debt, Fiscal Year Maturity [Abstract]
Total outstanding at December 31, 2016							$ 58,053	$ 64,692
Repayments of Long-term loan							5,281	4,876	$ 1,219
Long-term Debt, Current Maturities							7,900	6,638
Long-term Debt, Excluding Current Maturities							50,153	58,054
Line of credit | Term loan
Long-term Debt, Fiscal Year Maturity [Abstract]
Total outstanding at December 31, 2016							$ 53,625	58,906
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]
2016							$ 7,900
2017							6,931
2018							43,222
Total outstanding at December 31, 2016							2,951	$ 3,114
Mortgages | Land, buildings and improvements
Debt Instrument [Line Items]
Debt instrument, collateral amount							5,000
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
Number of satellite hubs purchased in period | satellite_hub								3
Debt instrument, fixed interest rate				3.08%	2.76%
Monthly debt payment				$ 21	$ 83
Long-term Debt, Fiscal Year Maturity [Abstract]
Total outstanding at December 31, 2016							1,477	$ 2,672
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
Proceeds from Lines of Credit			$ 35,000
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]
Debt Instrument, Periodic Payment, Principal			$ 1,200
Debt Instrument, Redemption, Period Two | Senior Credit Facility | Line of credit | Term loan
Long-term Debt, Fiscal Year Maturity [Abstract]
Debt Instrument, Periodic Payment, Principal			$ 1,600
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			1.25	1.75	1.00
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 One | Senior Credit Facility | Line of credit | Term loan
Long-term Debt, Fiscal Year Maturity [Abstract]
Repayments of Long-term loan	$ 6,000
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
Subsequent Event [Member] | 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