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Debt and Capital Lease Obligations (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Leveraged debt ratio	2.25
Letters of Credit Outstanding, Amount	$ 24,300	$ 19,300
Capital Lease Obligations	4,600
Capital Lease Obligations, Current	888
Debt Issuance Costs, Net	1,100
Insurance Programe Obligations [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	17,600	17,500
Contract Performance Obligations [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	$ 6,700	$ 1,800
Maximum [Member]
Debt Instrument [Line Items]
Interest coverage ratio	3.0
Debt Instrument Covenant Adjusted Leveraged Debt Ratio	3.5
Maximum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.375%
Maximum [Member] | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Letter of credit fee (as a percent)	2.125%
Maximum [Member] | Performance letters of credit [Member]
Debt Instrument [Line Items]
Letter of credit fee (as a percent)	1.125%
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Maximum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Minimum [Member]
Debt Instrument [Line Items]
Leveraged debt ratio	3.0
Minimum [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.20%
Minimum [Member] | Standby Letters of Credit [Member]
Debt Instrument [Line Items]
Letter of credit fee (as a percent)	1.125%
Minimum [Member] | Performance letters of credit [Member]
Debt Instrument [Line Items]
Letter of credit fee (as a percent)	0.625%
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Minimum [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.00%
Swing line Loans [Member] | Maximum [Member] | 2011 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 25,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000
Foreign Revolving Loans and Letters of Credit [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Foreign Revolving Loans and Letters of Credit [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Syndicated Credit Agreement [Member]
Debt Instrument [Line Items]
Term of the credit agreement	5 years
Syndicated Credit Agreement [Member] | 2016 Facility
Debt Instrument [Line Items]
Option to increase borrowing capacity	$ 100,000
Maximum borrowing capacity	250,000
Line of Credit Facility, Maximum Borrowing Capacity	250,000
Syndicated Credit Agreement [Member] | 2011 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	175,000
Line of Credit Facility, Maximum Borrowing Capacity	175,000
Credit Agreement [Member]
Debt Instrument [Line Items]
Maximum Acquisition Consideration Under Credit Agreement	$ 50,000
Credit Agreement [Member] | 2016 Facility
Debt Instrument [Line Items]
Percentage of Capital Stock From Direct Foreign Subsidiaries	65.00%
Credit Agreement [Member] | Foreign Revolving Loans and Letters of Credit [Member] | 2016 Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 50,000
Line of Credit Facility, Maximum Borrowing Capacity	$ 50,000

X

- Definition

Represents the adjusted maximum leveraged debt ratio under the credit agreement.

+ References

No definition available.

+ Details

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- Definition

Represent the minimum interest coverage ratio under the credit agreement.

+ References

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- Definition

Represents the maximum leveraged debt ratio under the credit agreement.

+ References

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- Definition

Represents the fees for the letter of credit facility, expressed as a percentage.

+ References

No definition available.

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- Definition

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- Definition

Maximum consideration for acquisitions under the credit agreement allows the expansion of the Leverage Ratio.

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- Definition

Percentage of capital stock from direct foreign subsidiaries pledged as collateral for a debt.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737

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
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-Section S99
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- Definition

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 840
-SubTopic 30
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- Definition

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

+ References

No definition available.

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- Definition

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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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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- Definition

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

+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

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- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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