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Debt (Credit Facility) (Narrative) (Details) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended |  |  |  |  |  | 0 Months Ended | 12 Months Ended |  |  |  | 0 Months Ended |  | 12 Months Ended | 0 Months Ended |  | 0 Months Ended | 12 Months Ended |  | 0 Months Ended |
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Dec. 31, 2013 | Dec. 31, 2013 Line of Credit [Member] | Dec. 31, 2012 Line of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] Federal Funds Rate [Member] Base Rate [Member] | Dec. 31, 2013 Line of Credit [Member] Eurocurrency [Member] Base Rate [Member] | Dec. 31, 2012 Line of Credit [Member] Letter of Credit [Member] | Dec. 31, 2012 Line of Credit [Member] Letter of Credit [Member] Maximum [Member] | Dec. 31, 2012 Line of Credit [Member] Letter of Credit [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] Revolving Credit Facility [Member] Weighted Average [Member] | Dec. 31, 2012 Line of Credit [Member] Revolving Credit Facility [Member] Weighted Average [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] | Dec. 31, 2012 Line of Credit [Member] 2011 Credit Facility [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Minimum [Member] | Dec. 31, 2012 Line of Credit [Member] 2011 Credit Facility [Member] Letter of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Letter of Credit [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Financial Standby Letter of Credit [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Financial Standby Letter of Credit [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Canada, Dollars Letter of Credit [Member] | Dec. 31, 2012 Line of Credit [Member] 2011 Credit Facility [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Revolving Credit Facility [Member] Maximum [Member] Base Rate [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Revolving Credit Facility [Member] Maximum [Member] Eurocurrency [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Revolving Credit Facility [Member] Minimum [Member] Base Rate [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Revolving Credit Facility [Member] Minimum [Member] Eurocurrency [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Financial Standby Letter of Credit [Member] Letter of Credit [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2011 Credit Facility [Member] Financial Standby Letter of Credit [Member] Letter of Credit [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Maximum [Member] Permitted Acquisition [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Minimum [Member] Permitted Acquisition [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Letter of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Letter of Credit [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Letter of Credit [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Financial Standby Letter of Credit [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Financial Standby Letter of Credit [Member] Minimum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Canada, Dollars Letter of Credit [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Revolving Credit Facility [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Revolving Credit Facility [Member] Maximum [Member] Base Rate [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Revolving Credit Facility [Member] Maximum [Member] Eurocurrency [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Revolving Credit Facility [Member] Minimum [Member] Base Rate [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Revolving Credit Facility [Member] Minimum [Member] Eurocurrency [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Revolving Credit Facility [Member] Canada, Dollars | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Financial Standby Letter of Credit [Member] Letter of Credit [Member] Maximum [Member] | Dec. 31, 2013 Line of Credit [Member] 2013 Credit Facility [Member] Financial Standby Letter of Credit [Member] Letter of Credit [Member] Minimum [Member] | Dec. 31, 2013 Loans Payable [Member] 2013 Credit Facility [Member] Maximum [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Oct. 29, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, revolving loan sublimit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  |  |  |  |  | 229,200,000 |  |  |  |  |  |  |  |  |  |  | 350,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 315,200,000 | 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 250,000,000
Line of credit, letter of credit sublimit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |
Swing loan |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred financing costs | 9,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53,000,000 |  |  |  |  |  |  |  |
Line of credit facility, interest rate |  |  |  |  |  |  | 2.00% | 1.00% | 2.14% | 3.95% |  |  |  |  |  |  | 1.50% | 1.25% | 0.75% |  |  |  |  |  |  | 2.50% | 1.50% |  |  |  |  |  |  |  |  | 0.75% | 1.00% | 0.50% |  |  |  |  |  |  |  | 2.00% | 1.00% |
Letters of credit, outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 134,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 345,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 562,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread, variable interest or fee |  |  |  | 0.50% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.50% | 2.50% | 0.50% | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.00% | 2.00% | 0.00% | 1.00% |  |  |  |
Unused credit facility fee |  | 0.30% | 0.35% |  |  |  |  |  |  |  |  |  | 0.45% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% |  | 0.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, percentage of consolidated EBITDA threshold, combined subsidiary guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit, percentage of consolidated EBITDA threshold, individual subsidiary guarantors |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, leverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 | 3.75 |  |  | 3.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, interest coverage ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.0 | 3.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, permitted acquisitions amount, adjusted ratio of indebtedness to net capital |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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