Debt (Tables)

3 Months Ended

Mar. 31, 2015

Debt Disclosure [Abstract]

Contingent Interest on Debt [Table Text Block]

The Trust PIERS have accrued and paid contingent interest (ranging from $0.07 to $0.11 per $50 stated liquidation amount of Trust PIERS) for each quarterly interest period since June 2013. 

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

The fair value of the Company’s fixed rate debt instruments is based on quoted market prices (Level II) and is summarized as follows (in thousands):

Fair Value of Financial Instruments
	March 31, 2015				December 31, 2014
Financial Instrument	Book Value		Market Value		Book Value		Market Value
4.75% senior notes, due 2022	$	400,000	$	414,000	$	400,000	$	408,000
5.00% senior notes, due 2024	300,000		328,100		300,000		316,700
3.75% convertible senior subordinated notes, due 2025
Carrying value	54,513		—		54,148		—
Unamortized debt discount	25,456		—		25,824		—
Principal amount	79,969		234,000		79,972		211,900
4.00% junior subordinated convertible debentures, due 2033
Carrying value	188,616		—		188,550		—
Unamortized debt discount	117,016		—		118,133		—
Principal amount	305,632		581,500		306,683		550,200
3.25% convertible senior debentures, due 2035
Carrying value	180,171		—		178,284		—
Unamortized debt discount	5,862		—		7,749		—
Principal amount	186,033		203,900		186,033		197,000
3.25% convertible senior exchange debentures, due 2035
Carrying value	217,615		—		216,738		—
Unamortized debt discount	23,852		—		24,729		—
Principal amount	241,467		282,500		241,467		279,500
3.50% convertible senior subordinated notes, due 2044
Carrying value	218,954		—		218,474		—
Unamortized debt discount	205,296		—		205,776		—
Principal amount	424,250		518,900		424,250		507,000

Summary of Debt

(in thousands):

	March 31, 2015			December 31, 2014
Revolving loans	$	—		$	—
Senior term loan, due 2019	390,000			395,000
4.75% senior notes, due 2022	400,000			400,000
5.00% senior notes, due 2024	300,000			300,000
3.75% convertible senior subordinated notes, due 2025	79,969			79,972
3.50% convertible senior subordinated notes, due 2044	424,250			424,250
4.00% junior subordinated convertible debentures, due 2033	305,632			306,683
3.25% convertible senior debentures, due 2035	186,033			186,033
3.25% convertible senior exchange debentures, due 2035	241,467			241,467
Capitalized lease and other debt obligations	11,201			13,083
Subtotal	2,338,552			2,346,488
(Subtract) unamortized debt discount	(377,482		)	(382,212		)
(Subtract) current portion of debt	(448,754		)	(446,717		)
Total long-term debt, net	$	1,512,316		$	1,517,559

Convertible debt and related equity

Information relating to the Company’s convertible securities at March 31, 2015 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	10.75	8.25	%
4.00% junior subordinated convertible debentures, due 2033	$	117,942	18.25	8.01	%
3.25% convertible senior debentures, due 2035	$	233,901	0.75	7.63	%
3.25% convertible senior exchange debentures, due 2035	$	25,259	6.00	5.24	%
3.50% convertible senior subordinated notes, due 2044	$	208,200	28.90	7.70	%