Long-Term Debt, Interest Rate Swap and Capitalized Lease Obligations (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total	$ 60,301	$ 47,941
Less current portion	(6,276)	(5,539)
Long-term debt, excluding current maturities	54,025	42,402
Mortgages \| Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below.
Debt Instrument [Line Items]
Total	$ 42,401	43,441
Mortgages \| Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below. \| Interest rate swap
Debt Instrument [Line Items]
Long-term debt, interest rate	6.87%
Mortgages \| Mortgage loan with a syndicate of banks; issued in March 2011, amended May 2013; payable monthly, interest at 4.5% above LIBOR, a portion of which is fixed at 6.87% based on the interest rate swap described below. \| LIBOR
Debt Instrument [Line Items]
Long-term debt, interest rate	4.50%
Mortgages \| Mortgage loan with The PrivateBank, issued in February 2015, interest-only loan, and a variable interest rate based on LIBOR, with a minimum base rate of 4.75%. \| The PrivateBank
Debt Instrument [Line Items]
Total	$ 5,000	0
Mortgages \| Mortgage loan with The PrivateBank, issued in February 2015, interest-only loan, and a variable interest rate based on LIBOR, with a minimum base rate of 4.75%. \| The PrivateBank \| LIBOR
Debt Instrument [Line Items]
Minimum base rate percentage	4.75%
Revolving credit facility \| Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 and further amended May 2013 and March 2014; secured by receivables of the Company; interest at 4.5% above LIBOR.
Debt Instrument [Line Items]
Total	$ 12,900	$ 4,500
Revolving credit facility \| Revolving credit facility borrowings payable to a bank; entered into in March 2010; amended in March 2011 and further amended May 2013 and March 2014; secured by receivables of the Company; interest at 4.5% above LIBOR. \| LIBOR
Debt Instrument [Line Items]
Long-term debt, interest rate	4.50%

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Minimum contractual interest rate for funds borrowed, under the debt 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(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

No definition available.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: 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

Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20, 22
-Article 5

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ 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 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ 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

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