Debt (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

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

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

Fair Value of Financial Instruments
	June 30, 2014				December 31, 2013
Financial Instrument	Book Value		Market Value		Book Value		Market Value
7.75% senior subordinated notes, due 2020	$	400,000	$	434,200	$	400,000	$	435,800
3.75% convertible senior subordinated notes, due 2025
Carrying value	53,468		—		87,310
Unamortized debt discount	26,541		—		45,098
Principal amount	80,009		196,600		132,408		306,500
4.00% junior subordinated convertible debentures, due 2033
Carrying value	187,441		—		186,136
Unamortized debt discount	119,681		—		121,017
Principal amount	307,122		501,000		307,153		455,900
3.25% convertible senior debentures, due 2035
Carrying value	401,243		—		393,126
Unamortized debt discount	26,257		—		34,374
Principal amount	427,500		455,900		427,500		457,400
3.75% convertible senior subordinated notes, due 2042
Carrying value	225,923		—		225,014
Unamortized debt discount	164,077		—		164,986
Principal amount	390,000		643,500		390,000		592,800
3.50% convertible senior subordinated notes, due 2044
Carrying value	217,542		—		216,643
Unamortized debt discount	206,708		—		207,607
Principal amount	424,250		492,100		424,250		428,500

Summary of Debt

(in thousands):

	June 30, 2014			December 31, 2013
Revolving loans, due 2017	$	—		$	—
Senior term loan, due 2017	387,813			398,438
7.75% senior subordinated notes, due 2020	400,000			400,000
3.75% convertible senior subordinated notes, due 2025	80,009			132,408
4.00% junior subordinated convertible debentures, due 2033	307,122			307,153
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			424,250
Capitalized lease and other debt obligations	16,839			20,685
Subtotal	2,433,533			2,500,434
Add interest rate swap agreements	22,088			18,671
(Subtract) unamortized debt discount	(543,264		)	(573,082		)
(Subtract) current portion of debt	(494,738		)	(527,204		)
Total long-term debt, net	$	1,417,619		$	1,418,819

Convertible debt and related equity

Information relating to the Company's convertible securities at June 30, 2014 is 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	11.50	8.25	%
4.00% junior subordinated convertible debentures, due 2033	$	118,348	19.00	8.01	%
3.25% convertible senior debentures, due 2035	$	245,433	1.50	7.63	%
3.75% convertible senior subordinated notes, due 2042	$	167,941	27.75	7.30	%
3.50% convertible senior subordinated notes, due 2044	$	208,200	29.65	7.70	%