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Debt (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 Senior unsecured notes due October 2021 [Member] | Nov. 30, 2013 Senior unsecured notes due October 2021 [Member] | Oct. 31, 2013 Senior unsecured notes due October 2021 [Member] | Dec. 31, 2013 Senior secured revolving credit facility [Member] | Dec. 31, 2012 Senior secured revolving credit facility [Member] | Dec. 31, 2013 Revolving Credit Facility [Member] Senior secured revolving credit facility [Member] | Dec. 31, 2013 Letter of Credit [Member] Senior secured revolving credit facility [Member] | Dec. 31, 2013 Swingline Loan [Member] Senior secured revolving credit facility [Member] | Dec. 31, 2013 Rental equipment [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  |  |  | $ 100,000,000.0 | $ 300,000,000.0 |  |  |  |  |  |
Debt instrument, issuance price of par, percentage |  |  |  | 103.25% |  |  |  |  |  |  |
Debt instrument, stated interest rate |  |  |  |  | 6.25% |  |  |  |  |  |
Proceeds from issuance of senior debt | 403,250,000 | 0 | 394,000,000 |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | 600,000,000 | 75,000,000 | 25,000,000 |
Line of credit facility, additional borrowing capacity |  |  |  |  |  |  |  |  |  |  | 300,000,000.0
Weighted average interest rates |  |  |  |  |  | 2.17% | 2.21% |  |  |  |
Total funded debt to EBITDA ratio |  |  |  |  |  | 4.50 |  |  |  |  |
Senior secured debt to adjusted EBITDA ratio |  |  |  |  |  | 3.50 |  |  |  |  |
EBITDA to interest expense ratio |  |  |  |  |  | 3.0 |  |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  |  |  |  | $ 475,400,000 |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: 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=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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