Credit Risk and Fair Value of Financial Instruments Level 3 (Tables)

12 Months Ended

Dec. 31, 2015

Credit Risk and Fair Value of Financial Instruments [Abstract]

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

The fair value of our debt instruments at December 31 was as follows:

	2015		2014
	(In thousands)
6.75% Senior Notes due April 2016	$	—	$	208,075
7.0% Senior Notes due June 2017	314,618		320,043
7.625% Senior Notes due October 2018	279,375		277,538
4.5% Senior Notes due November 2020	201,500		201,700
8.0% Senior Notes due November 2021	176,438		174,375
5.375% Senior Notes due January 2022	445,188		437,750
5.375% Senior Notes due May 2024	884,094		558,250
7.5% Senior Notes due April 2027	216,500		220,890
Term Loan due July 2018	310,000		370,000
Bank Credit Facility due July 2018	270,000		235,000
Mortgage notes and other debt, maturities through 2050	4,047		4,277
Total fair value of debt instruments	$	3,101,760	$	3,007,898