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Long-Term Debt (Tables)
 12 Months Ended
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.