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Long-Term Debt, Schedule of Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |
Long-term Debt | $ 778,834,000 | $ 716,700,000
Revolving Credit Facility Due April 30, 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 278,834,000 | 0
Credit facility, expiration date | Apr. 30, 2020 |
Long term debt, face amount | $ 550,000,000 |
Revolving Credit Facility Due November 9, 2015 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 0 | 116,700,000
Credit facility, expiration date | Nov. 09, 2015 |
Long term debt, face amount | $ 325,000,000 |
Senior Notes Series A Due February 27, 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 150,000,000 | 150,000,000
Credit facility, expiration date | Feb. 27, 2020 |
Long term debt, face amount | $ 150,000,000 |
Senior Notes Series B Due February 27, 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 350,000,000 | 350,000,000
Credit facility, expiration date | Feb. 27, 2023 |
Long term debt, face amount | $ 350,000,000 |
Credit Line Due June 30, 2017 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 0 | 0
Credit facility, expiration date | Jun. 30, 2017 |
Long term debt, face amount | $ 10,000,000 |
Term Loan Due July 1, 2016 [Member] |  |
Debt Instrument [Line Items] |  |
Credit facility, amount outstanding | $ 0 | 100,000,000
Credit facility, expiration date | Jul. 01, 2016 |
Long term debt, face amount | $ 540,000,000 |
Revolving Credit Facility [Member] |  |
Debt Instrument [Line Items] |  |
Long term debt, face amount |  | $ 325,000,000

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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 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: 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 + 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 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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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 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 02 -Paragraph 20, 22 -Article 5 + Details
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