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Debt Debt (Schedule of Line of Credit Facilities) (Details) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 701,100,000.0 |
Syndicated Credit Facility $850 Million [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | Dec. 31, 2019 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 850,000,000 |
Long-term Line of Credit | $ 313,659,000 | $ 204,774,000
Line of Credit Facility, Interest Rate Description | Senior unsecured long-term debt rating |
Credit Facility 120 Million [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | May 31, 2016 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 120,000,000 |
Long-term Line of Credit | $ 85,040,000 | 80,040,000
Line of Credit Facility, Interest Rate Description | Fixed |
Credit Facility 270 Million [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | Nov. 30, 2017 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 270,000,000 |
Long-term Line of Credit | $ 270,000,000 | 270,000,000
Line of Credit Facility, Interest Rate Description | Fixed |
Credit Facility 100 Million [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | Jun. 30, 2017 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 100,000,000 |
Long-term Line of Credit | $ 68,657,000 | 81,747,000
Line of Credit Facility, Interest Rate Description | Fixed |
Credit Facility 58 Million [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | Nov. 30, 2014 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 129,214,000 |
Long-term Line of Credit | $ 66,154,000 | 74,623,000
Line of Credit Facility, Interest Rate Description | Fixed |
Credit Facility 132 Million [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | Mar. 31, 2019 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 45,422,000 |
Long-term Line of Credit | $ 45,422,000 | 80,961,000
Line of Credit Facility, Interest Rate Description | Fixed |
Credit Facility Variable Due May Two Thousand Sixteen [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of Credit Facility, Expiration Date | May 31, 2016 |
Line of Credit Facility, Maximum Borrowing Capacity | $ 36,430,000 |
Long-term Line of Credit | $ 36,430,000 | $ 28,612,000
Line of Credit Facility, Interest Rate Description | Fixed |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions 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 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 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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Balance Type: | credit
Period Type: | instant

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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 + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + 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 + Details
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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. + References No definition available. + 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 + Details
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