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Long-Term Debt and Capital Lease Obligations (Details Textual) - USD ($) | 1 Months Ended | 7 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 29, 2018 | Jun. 30, 2016 | Dec. 31, 2015 | Dec. 28, 2017 | Dec. 29, 2016 | May 28, 2015 | Feb. 28, 2013
Debt Instrument, Periodic Payment, Total |  |  |  | $ 39,110 |  |  |
Senior Notes, Noncurrent |  |  |  | $ 129,143,000 | $ 90,286,000 |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  |  | 5.75% |  |  |
Line of Credit Facility, Commitment Fee Percentage |  |  |  | 0.20% |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | $ 91,000,000 |  |  |
Interest Paid, Net |  |  | $ 5,220,000 | 11,453,000 | 9,105,000 | $ 9,353,000 |
Derivative, Amount of Hedged Item |  |  |  |  |  |  | $ 25,000,000
Derivative Liability, Notional Amount |  |  |  | 25,000,000 |  |  |
Derivative Instruments Loss Reclassified From Accumulated Income Effective Portion Net Of Tax |  | $ 96,000 |  |  |  |  |
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion |  | $ 159,000 |  |  |  |  |
Commitment Minimum Lease Payments |  |  |  | 6,163,000 |  |  |
Obligation To Be Reduced In Next 12 Months |  |  |  | 5,657,000 |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  |  | 35,000,000 |  |  |
Digital Systems [Member] |  |  |  |  |  |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  |  |  | 34,471,000 | 28,294,000 |  |
Capital Leases, Balance Sheet, Assets by Major Class, Net |  |  |  | 45,510,000 | 45,510,000 |  |
Furniture and Fixtures [Member] |  |  |  |  |  |  |
Capital Leased Assets, Gross |  |  |  | 1,712,000 | 1,712,000 |  |
Capital Leases, Balance Sheet, Assets by Major Class, Net |  |  |  | 255,000 |  |  |
Building and Building Improvements [Member] |  |  |  |  |  |  |
Capital Leased Assets, Gross |  |  |  | 25,648,000 | $ 15,799,000 |  |
Capital Leases, Balance Sheet, Assets by Major Class, Net |  |  |  | $ 2,300,000 |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | $ 50,000,000 |  |  |  |  |  |
Subsequent Event [Member] | First Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 2.559% |  |  |  |  |  |
Derivative, Notional Amount | $ 25,000,000 |  |  |  |  |  |
Derivative, Maturity Date | Mar. 01, 2021 |  |  |  |  |  |
Subsequent Event [Member] | Second Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative, Fixed Interest Rate | 2.687% |  |  |  |  |  |
Derivative, Notional Amount | $ 25,000,000 |  |  |  |  |  |
Derivative, Maturity Date | Mar. 01, 2023 |  |  |  |  |  |
Senior Notes [Member] |  |  |  |  |  |  |
Long-term Debt, Weighted Average Interest Rate |  |  |  | 4.70% | 5.10% |  |
Minimum [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  |  | 4.02% |  |  |
Maximum [Member] | Senior Notes [Member] |  |  |  |  |  |  |
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate |  |  |  | 6.55% |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |  |
Long-term Line of Credit |  |  |  | $ 130,000,000 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.67% | 1.83% |  |
Credit Agreement [Member] |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  | $ 225,000,000 |  |  |
Interest Rate Swap [Member] |  |  |  |  |  |  |
Derivative, Fixed Interest Rate |  |  |  |  |  |  | 0.96%
Derivative, Variable Interest Rate |  |  |  | 1.56% |  |  |
Decrease In Interest Expense |  |  |  | $ 7,000 |  |  |
Mortgage Notes [Member] |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate |  |  |  | 4.22% | 4.70% |  |
Mortgage Notes [Member] | Minimum [Member] |  |  |  |  |  |  |
Interest Rate of Unsecured Term Note |  |  |  | 3.00% |  |  |
Mortgage Notes [Member] | Maximum [Member] |  |  |  |  |  |  |
Interest Rate of Unsecured Term Note |  |  |  | 5.03% |  |  |

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- Definition The minimum lease payment of commitment during the period. + References No definition available. + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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(a)(1)) -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 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition The effective portion of loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 + Details
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- Definition Amount of cash paid, after deduction of cash paid for capitalized interest, for interest. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
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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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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