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Fair Value Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2018
Fair Value Disclosures [Abstract] |
Fair Value Measurements, Nonrecurring | The fair value of our senior notes is based on Level 1 inputs and was as follows at March 31, 2018 and December 31, 2017:
| March 31, 2018 |  | December 31, 2017
(in thousands) | Carrying Value |  | Fair Value |  | Difference |  | Carrying Value |  | Fair Value |  | Difference
6.625% senior notes | $ | 292,740 |  |  | $ | 266,774 |  |  | $ | (25,966 | ) |  | $ | 292,740 |  |  | $ | 278,835 |  |  | $ | (13,905 | )
4.75% senior notes | 250,000 |  |  | 221,575 |  |  | (28,425 | ) |  | 250,000 |  |  | 237,500 |  |  | (12,500 | )
Total senior notes | $ | 542,740 |  |  | $ | 488,349 |  |  | $ | (54,391 | ) |  | $ | 542,740 |  |  | $ | 516,335 |  |  | $ | (26,405 | )

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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