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Debt (Narrative) (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended |  |  |  |  |  |
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Jun. 30, 2014 item | Dec. 31, 2013 | Jun. 30, 2014 Maximum [Member] | Jun. 30, 2014 Minimum [Member] | May 31, 2013 Outdated Unsecured Short Term Revolving Credit Facility [Member] | Jun. 30, 2014 Amended And Restated Unsecured Short Term Revolving Credit Facility [Member] | Jun. 30, 2014 Minimum Credit Spread On LIBOR Or CDOR Borrowings [Member] | Jun. 30, 2014 Maximum Credit Spread On LIBOR Or CDOR Borrowings [Member] | Jun. 30, 2014 Maximum Credit Spread On Prime Rate Borrowings [Member] | Jun. 30, 2014 Senior Notes [Member] item | Jul. 21, 2014 Senior Notes [Member] | Dec. 31, 2013 Senior Notes [Member] | Jul. 21, 2014 Series A Senior Note [Member] | Dec. 31, 2013 Series A Senior Note [Member] | Jul. 21, 2014 Series B Senior Note [Member] | Dec. 31, 2013 Series B Senior Note [Member]
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing capacity |  |  |  |  | $ 450,000,000 | $ 700,000,000 |  |  |  |  |  |  |  |  |  |
Credit Facility maturity date |  |  |  |  |  | Jun. 18, 2019 |  |  |  |  |  |  |  |  |  |
Outstanding Credit Facility balance | 384,000,000 | 277,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Facility weighted average interest rates on outstanding balance | 1.40% | 1.60% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of Credit Facility Availability | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit spread during period |  |  |  |  |  |  | 0.875% | 1.375% | 0.375% |  |  |  |  |  |  |
Credit Facility borrowings hedged | 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fees |  |  | 0.35% | 0.15% |  |  |  |  |  |  |  |  |  |  |  |
Consolidated leverage ratio under credit facility, maximum | 3.5 |  |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |
Notes Payable |  |  |  |  |  |  |  |  |  |  | $ 125,000,000 | $ 150,000,000 | $ 50,000,000 | $ 75,000,000 | $ 75,000,000 | $ 75,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 3.32% | 3.94% | 3.76% | 4.04%
Minimum Allowable Prepayment under Senior Notes |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |

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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. + 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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- Definition The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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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 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the 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 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Line-of-Credit Arrangement -URI http://asc.fasb.org/extlink&oid=6517033 + Details
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- Definition Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 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 03 -Paragraph 13, 16 -Article 9 + Details
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