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Long-Term Debt (Tables) | 12 Months Ended
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Dec. 31, 2014
Debt Instrument [Line Items] |
Summary of long-term debt | The Company carries its long-term debt at face value, net of applicable discounts. Long-term debt consisted of the following:
|  | December 31,
|  | 2014 |  | 2013
|  | (In thousands)
2.25% Convertible Senior Notes due 2036 (principal of $0 and $182,753 at December 31, 2014 and 2013, respectively) |  | $ | — |  |  | $ | 160,334 |
3.00% Convertible Senior Notes due 2020 (principal of $0 and $115,000 at December 31, 2014 and 2013, respectively) |  | — |  |  | 84,305 |
5.00% Senior Notes (principal of $550,000 at December 31, 2014) |  | 540,100 |  |  | — |
Real Estate Credit Facility |  | 58,003 |  |  | 67,719 |
Acquisition Line |  | 69,713 |  |  | 60,000 |
Other real estate related and long-term debt |  | 358,271 |  |  | 280,230 |
Capital lease obligations related to real estate, maturing in varying amounts through June 2034 with a weighted average interest rate of 9.5% |  | 55,380 |  |  | 46,490 |
|  | 1,081,467 |  |  | 699,078 |
Less current maturities of real estate credit facility and other long-term debt |  | 72,630 |  |  | 35,389 |
|  | $ | 1,008,837 |  |  | $ | 663,689 |
Schedule of Maturities of Long-term Debt [Table Text Block] | The aggregate annual maturities of long-term debt for the next five years are as follows:
| Total
| (In thousands)
Year Ended December 31, |
2015 | $ | 72,629 |
2016 | 57,914 |
2017 | 75,791 |
2018 | 116,878 |
2019 | 72,723 |
Thereafter | 685,532 |
Total | $ | 1,081,467 |
3.00% Convertible Notes due 2020 |
Debt Instrument [Line Items] |
Contractual Interest Expense And Discount Amortization Table [Text Block] | For the years ended December 31, 2014, 2013 and 2012, the contractual interest expense and the discount amortization, which is recorded as interest expense in the accompanying Consolidated Statements of Operations, were as follows:
|  | Year Ended December 31,
|  | 2014 |  | 2013 |  | 2012
|  | (dollars in thousands)
Year-to-date contractual interest expense |  | $ | 1,839 |  |  | $ | 3,450 |  |  | $ | 3,450 |
Year-to-date discount amortization(1) |  | $ | 1,810 |  |  | $ | 3,251 |  |  | $ | 2,966 |
Effective interest rate of liability component |  | 8.6 | % |  | 8.6 | % |  | 8.6 | %
(1) Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt.
2.25% Convertible Notes due 2036 |
Debt Instrument [Line Items] |
Contractual Interest Expense And Discount Amortization Table [Text Block] | For the years ended December 31, 2014, 2013, and 2012, the contractual interest expense and the discount amortization relative to the 2.25% Notes, which is recorded as other interest expense in the accompanying Consolidated Statements of Operations, were as follows:
|  | Year Ended December 31,
|  | 2014 |  | 2013 |  | 2012
|  | (dollars in thousands)
Year-to-date contractual interest expense |  | $ | 1,875 |  |  | $ | 4,112 |  |  | $ | 4,112 |
Year-to-date discount amortization(1) |  | $ | 5,366 |  |  | $ | 7,530 |  |  | $ | 6,948 |
Effective interest rate of liability component |  | 7.7 | % |  | 7.7 | % |  | 7.7 | %
(1) Represents the incremental impact of the accounting for convertible debt as primarily codified in ASC 470, Debt.

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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=6584090&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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 7: 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 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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