Debt (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Convertible Securities Detail [Table Text Block]

Information relating to the Company’s convertible securities at December 31, 2014 is set forth in the following table:

Convertible Debt	Carrying Value of Equity Component (in thousands)		Remaining Amortization Period	Effective Interest Rate
3.75% convertible senior subordinated notes, due 2025	$	6,913	11.00	8.250	%
4.00% junior subordinated convertible debentures, due 2033	$	118,348	18.50	8.010	%
3.25% convertible senior debentures, due 2035	$	233,901	1.00	7.630	%
3.25% convertible senior exchange debentures, due 2035	$	25,259	6.25	5.240	%
3.50% convertible senior subordinated notes, due 2044	$	208,200	29.15	7.700	%

Summary of Debt

ollowing table summarizes the Company’s debt (in thousands):

	December 31,
	2014			2013
Revolving loans	$	—		$	—
Senior term loan, due 2017	—			398,438
Senior term loan, due 2019	395,000			—
7.75% senior subordinated notes, due 2020	—			400,000
4.75% senior notes, due 2022	400,000			—
5.00% senior notes, due 2024	300,000			—
3.75% convertible senior subordinated notes, due 2025	79,972			132,408
3.75% convertible senior subordinated notes, due 2042	—			390,000
3.50% convertible senior subordinated notes, due 2044	424,250			424,250
4.00% junior subordinated convertible debentures, due 2033	306,683			307,153
3.25% convertible senior debentures, due 2035	186,033			427,500
3.25% convertible senior exchange debentures, due 2035	241,467			—
Capitalized lease and other debt obligations	13,083			20,685
Subtotal	2,346,488			2,500,434
Add interest rate swap agreements	—			18,671
(Subtract) unamortized debt discount	(382,212		)	(573,082		)
(Subtract) current portion of debt	(446,717		)	(527,204		)
Total long-term debt, net	$	1,517,559		$	1,418,819

Schedule of Maturities of Long-term Debt [Table Text Block]

The following is a schedule of the Company’s required debt payments, excluding any unamortized debt discount, due during each of the next five years and thereafter, as of December 31, 2014 (in thousands):

Year ended
December 31,
2015 (1)	$	598,423
2016	24,680
2017	22,470
2018	20,198
2019	315,000
Later years	1,365,717
Total debt payments	$	2,346,488

Fair Value, by Balance Sheet Grouping [Table Text Block]

The fair value of the Company’s fixed-rate debt instruments, excluding the previously disclosed interest rate swap values, is based on quoted market prices (Level 2) and is summarized as follows (in thousands):

Fair Value of Financial Instruments

	December 31, 2014				December 31, 2013
Financial Instrument:	Book Value		Market Value		Book Value		Market Value
7.75% senior subordinated notes, due 2020	$	—	$	—	$	400,000	$	435,800
4.75% senior notes, due 2022	400,000		408,000		—		—
5.00% senior notes, due 2024	300,000		316,700		—		—
3.75% convertible senior subordinated notes, due 2025
Carrying value	54,148		—		87,310		—
Unamortized debt discount	25,824		—		45,098		—
Principal amount	79,972		211,900		132,408		306,500
4.00% junior subordinated convertible debentures, due 2033
Carrying value	188,550		—		186,136		—
Unamortized debt discount	118,133		—		121,017		—
Principal amount	306,683		550,200		307,153		455,900
3.25% convertible senior debentures, due 2035
Carrying value	178,284		—		393,126		—
Unamortized debt discount	7,749		—		34,374		—
Principal amount	186,033		197,000		427,500		457,400
3.25% convertible senior exchange debentures, due 2035
Carrying value	216,738		—		—		—
Unamortized debt discount	24,729		—		—		—
Principal amount	241,467		279,500		—		—
3.75% convertible senior debentures, due 2042
Carrying value	—		—		225,014		—
Unamortized debt discount	—		—		164,986		—
Principal amount	—		—		390,000		592,800
3.50% convertible senior debentures, due 2044
Carrying value	218,474		—		216,643		—
Unamortized debt discount	205,776		—		207,607		—
Principal amount	424,250		507,000		424,250		428,500