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

12 Months Ended

Dec. 31, 2016

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:

	2016		2015
	(In thousands)
7.0% Senior Notes due June 2017	$	—	$	314,618
7.625% Senior Notes due October 2018	272,353		279,375
4.5% Senior Notes due November 2020	205,000		201,500
8.0% Senior Notes due November 2021	175,500		176,438
5.375% Senior Notes due January 2022	444,614		445,188
5.375% Senior Notes due May 2024	884,000		884,094
7.5% Senior Notes due April 2027	231,590		216,500
Term Loan due July 2018	—		310,000
Bank Credit Facility due July 2018	—		270,000
Term Loan due March 2021	673,750		—
Bank Credit Facility due March 2021	350,000		—
Mortgage notes and other debt, maturities through 2050	3,753		4,047
Total fair value of debt instruments	$	3,240,560	$	3,101,760