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Debt and Credit Agreements (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt Disclosure [Abstract] |
Company's Long-Term Debt and credit agreements Components | The Company's debt and credit agreements consisted of the following:
| December 31,
(In thousands) | 2014 |  | 2013
Long-Term Debt |  |  |  |  |
7.33% weighted-average fixed rate notes | $ | 20,000 |  |  | $ | 20,000 |
6.51% weighted-average fixed rate notes | 425,000 |  |  | 425,000 |
9.78% fixed rate notes | 67,000 |  |  | 67,000 |
5.58% weighted-average fixed rate notes | 175,000 |  |  | 175,000 |
3.65% weighted-average fixed rate notes | 925,000 |  |  | — |
Revolving credit facility | 140,000 |  |  | 460,000 |
| $ | 1,752,000 |  |  | $ | 1,147,000 |
7.33% weighted-average fixed rate notes |
Debt |
Schedule of long-term debt instruments by issued tranche |
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 75,000,000 |  |  | 10 years |  | July 2011 |  | 7.26 | %
Tranche 2 | $ | 75,000,000 |  |  | 12 years |  | July 2013 |  | 7.36 | %
Tranche 3 | $ | 20,000,000 |  |  | 15 years |  | July 2016 |  | 7.46 | %
6.51% weighted-average fixed rate notes |
Debt |
Schedule of long-term debt instruments by issued tranche |
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 245,000,000 |  |  | 10 years |  | July 2018 |  | 6.44 | %
Tranche 2 | $ | 100,000,000 |  |  | 12 years |  | July 2020 |  | 6.54 | %
Tranche 3 | $ | 80,000,000 |  |  | 15 years |  | July 2023 |  | 6.69 | %
5.58% Weighted Average Fixed Rate Notes |
Debt |
Schedule of long-term debt instruments by issued tranche |
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 88,000,000 |  |  | 10 years |  | January 2021 |  | 5.42 | %
Tranche 2 | $ | 25,000,000 |  |  | 12 years |  | January 2023 |  | 5.59 | %
Tranche 3 | $ | 62,000,000 |  |  | 15 years |  | January 2026 |  | 5.80 | %
3.65% weighted-average fixed rate notes |
Debt |
Schedule of long-term debt instruments by issued tranche | The notes have bullet maturities and were issued in three separate tranches as follows:
| Principal |  | Term |  | Maturity Date |  | Coupon
Tranche 1 | $ | 100,000,000 |  |  | 7 years |  | September 2021 |  | 3.24 | %
Tranche 2 | $ | 575,000,000 |  |  | 10 years |  | September 2024 |  | 3.67 | %
Tranche 3 | $ | 250,000,000 |  |  | 12 years |  | September 2026 |  | 3.77 | %
Revolving credit facility |
Debt |
Schedule of changes in the basis spread on LIBOR and Prime rates for changes in the percentage of total indebtedness to the borrowing base |
| Debt Percentage
| <25% |  | 25% <50% |  | 50% <75% |  | 75% <90% |  | 90%
Eurodollar loans | 1.50 | % |  | 1.75 | % |  | 2.00 | % |  | 2.25 | % |  | 2.50 | %
ABR loans | 0.50 | % |  | 0.75 | % |  | 1.00 | % |  | 1.25 | % |  | 1.50 | %

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + 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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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