Debt (Credit Facility Pricing Terms, Guarantees and Covenants) (Narrative) (Details)	12 Months Ended
	Dec. 31, 2013
Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, interest rate description	Amounts borrowed under the 2013 Credit Facility bear interest, at the Company’s option, at a rate equal to either (a) a Eurocurrency Rate (as defined in the 2013 Credit Facility) plus a margin of 1.00% to 2.00% (a reduction from 1.50% to 2.50% under the 2011 Credit Facility) or (b) a Base Rate (as described below) plus a margin of 0.00% to 1.00% (a reduction from 0.50% to 1.50% under the 2011 Credit Facility). Financial standby letters of credit and commercial letters of credit issued under the 2013 Credit Facility are subject to a letter of credit fee of 1.00% to 2.00% (a reduction from 1.50% to 2.50% under the 2011 Credit Facility), and performance standby letters of credit are subject to a letter of credit fee of 0.50% to 1.00% (a reduction from 0.75% to 1.25% under the 2011 Credit Facility).
Line of credit facility, commitment fee description	The Company must also pay a commitment fee to the lenders of 0.20% to 0.40% (a reduction from 0.25% to 0.45% under the 2011 Credit Facility) on any unused availability under the 2013 Credit Facility.
Line of Credit [Member] | Guarantees [Member]
Debt Instrument [Line Items]
Line of credit facility, collateral	The 2013 Credit Facility is guaranteed by certain subsidiaries of the Company (the “Subsidiary Guarantors”) and the obligations under the 2013 Credit Facility are secured by substantially all of the Company’s and the Subsidiary Guarantors’ respective assets, subject to certain exceptions. Under the 2013 Credit Facility, if the "Loan Party EBITDA" (as defined in the 2013 Credit Facility) as of the last four consecutive fiscal quarters does not represent at least 70% (the “70% Guaranty Threshold”) of the "Adjusted Consolidated EBITDA" (as defined in the 2013 Credit Facility) for such period, then the Company must designate additional subsidiaries as Subsidiary Guarantors, and cause them to join the applicable guaranty and security agreements to the 2013 Credit Facility. The 70% Guaranty Threshold represents a reduction from the 80% threshold applicable under the 2011 Credit Facility. Additionally, any domestic subsidiary with consolidated EBITDA of at least 15% of the Adjusted Consolidated EBITDA must become a Subsidiary Guarantor and join the applicable guaranty and security agreements, which represents an increase from the 10% threshold applicable under the 2011 Credit Facility.
2013 Credit Facility [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Line of credit facility, revolving credit conversion to term loan description	Under the 2013 Credit Facility, the Company has the option to increase the revolving commitments and/or establish additional term loan tranches from time to time in an aggregate amount of up to $250 million. These additional term loan tranches may, subject to certain terms and conditions described in the 2013 Credit Facility, rank equal or junior in respect of right of payment and/or collateral to the 2013 Credit Facility and may, subject to certain limitations described in the 2013 Credit Facility, have terms and pricing that differ from the 2013 Credit Facility.
2013 Credit Facility [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of credit facility, covenant terms	As amended, the 2013 Credit Facility continues to require that the Company maintain a maximum consolidated leverage ratio (as defined in the 2013 Credit Facility) of 3.50 and a minimum consolidated interest coverage ratio (as defined in the 2013 Credit Facility) of 3.00; however, the 2013 Credit Facility now provides that, for purposes of calculating the consolidated leverage ratio, funded indebtedness will exclude all undrawn standby performance letters of credit. Additionally, subject to certain conditions, if a permitted acquisition or series of permitted acquisitions having consideration exceeding $50 million occurs during a fiscal quarter, the Company has the right to permit the consolidated leverage ratio to exceed 3.50 during such fiscal quarter and the subsequent two fiscal quarters so long as the consolidated leverage ratio does not exceed 3.75 at any time during such period. Such right may be exercised no more than two times during the term of the 2013 Credit Facility. Subject to customary exceptions, the 2013 Credit Facility limits the borrowers’ and the Subsidiary Guarantors’ ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions or repurchases of capital stock. However, distributions payable solely in capital stock are permitted. The 2013 Credit Facility provides for customary events of default and carries cross-default provisions with the Company’s other significant debt instruments, including the Company’s indemnity agreement with its surety provider, as well as customary remedies upon an Event of Default (as defined in the 2013 Credit Facility), including the acceleration of repayment of outstanding amounts and other remedies with respect to the collateral securing the 2013 Credit Facility obligations.
2013 Credit Facility [Member] | Line of Credit [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Line of credit facility, description of variable rate	In each of the foregoing cases, the applicable margin or fee is based on the Company’s consolidated leverage ratio (as defined in the 2013 Credit Facility) as of the then most recent fiscal quarter. The Base Rate equals the highest of (i) the Federal Funds Rate (as defined in the 2013 Credit Facility) plus 1/2 of 1%, (ii) Bank of America’s prime rate and (iii) the Eurocurrency Rate plus 1.00%.