Debt (Tables)

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Convertible Securities Detail [Table Text Block]

Information relating to the Company's convertible securities at December 31, 2013 can be found 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	$	11,437	12.00	8.250	%
4.00% junior subordinated convertible debentures, due 2033	$	119,396	19.50	8.010	%
3.25% convertible senior debentures, due 2035	$	245,433	2.00	7.630	%
3.75% convertible senior subordinated notes, due 2042	$	167,941	28.25	7.300	%
3.50% convertible senior subordinated notes, due 2044	$	208,200	30.15	7.700	%

Summary of Debt

A summary of debt follows (in thousands):

	December 31,
	2013			2012
Revolving loans, due 2017	$	—		$	—
Senior term loan, due 2017	398,438			419,688
7.75% senior subordinated notes, due 2020	400,000			550,000
3.75% convertible senior subordinated notes, due 2025	132,408			318,054
4.00% junior subordinated convertible debentures, due 2033	307,153			345,000
3.25% convertible senior debentures, due 2035	427,500			427,500
3.75% convertible senior subordinated notes, due 2042	390,000			390,000
3.50% convertible senior subordinated notes, due 2044	424,250			—
Capitalized lease and other debt obligations	20,685			23,685
Subtotal	2,500,434			2,473,927
Add interest rate swap agreements	18,671			46,090
(Subtract) unamortized debt discount	(573,082		)	(462,274		)
(Subtract) current portion of debt	(527,204		)	(27,713		)
Total long-term debt, net	$	1,418,819		$	2,030,030

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

The following is a schedule of required debt payments, excluding the unamortized debt discount, due during each of the next five years and thereafter, as of December 31, 2013 (in thousands):

Year ended
December 31,
2014	$	858,431
2015	27,097
2016	25,805
2017	337,153
2018	198
Later years	1,251,750
Total debt payments	$	2,500,434

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

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

Fair Value of Financial Instruments

	December 31, 2013				December 31, 2012
Financial Instrument:	Book Value		Market Value		Book Value		Market Value
7.75% senior subordinated notes, due 2020, gross	$	400,000	$	435,800	$	550,000	$	614,600
3.75% convertible senior subordinated notes, due 2025
Carrying value	87,310		—		204,608		—
Unamortized debt discount	45,098		—		113,446		—
Principal amount	132,408		306,500		318,054		459,600
4.00% junior subordinated convertible debentures, due 2033
Carrying value	186,136		—		206,266		—
Unamortized debt discount	121,017		—		138,734		—
Principal amount	307,153		455,900		345,000		331,600
3.25% convertible senior debentures, due 2035
Carrying value	393,126		—		377,782		—
Unamortized debt discount	34,374		—		49,718		—
Principal amount	427,500		457,400		427,500		425,400
3.75% convertible senior debentures, due 2042
Carrying value	225,014		—		229,624		—
Unamortized debt discount	164,986		—		160,376		—
Principal amount	390,000		592,800		390,000		397,100
3.50% convertible senior debentures, due 2044
Carrying value	216,643		—		—		—
Unamortized debt discount	207,607		—		—		—
Principal amount	424,250		428,500		—		—