Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Measurements

Recurring fair value measurements

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3
	(In thousands)
Assets:
Short-term investments:
Available-for-sale equity securities	$	22,909	$	5,450	$	—
Mortgage-CMO debt securities		—		10		—
Total short-term investments	$	22,909	$	5,460	$	—

Fair value of financial instruments

	As of December 31,
				2017							2016
	Effective						Effective
	Interest		Carrying		Fair		Interest		Carrying			Fair
	Rate		Value		Value		Rate		Value			Value
			(In thousands)						(In thousands)
6.15% senior notes due February 2018	6.27	%	$	460,762	$	462,674	6.40	%	$	827,539		$	865,300
9.25% senior notes due January 2019	9.77	%		303,489		321,028	9.33	%		303,489			337,443
5.00% senior notes due September 2020	5.43	%		669,846		670,757	5.21	%		669,540			689,211
4.625% senior notes due September 2021	4.76	%		695,108		665,003	4.75	%		694,868			708,765
5.50% senior notes due January 2023	5.85	%		600,000		584,850	5.85	%		600,000			627,000
5.10% senior notes due September 2023	5.28	%		346,576		325,844	5.26	%		346,448			348,613
0.75% senior exchangeable notes due January 2024	5.90	%		429,982		443,940	—	%		—			—
Term loan facility	—	%		—		—	1.76	%		162,500			162,500
Revolving credit facility	2.73	%		510,000		510,000	1.86	%		—			—
Commercial paper	1.87	%		40,000		40,000	1.16	%		—			—
Other	—	%		181		181	—	%		297			297
				4,055,944	$	4,024,277				3,604,681		$	3,739,129
Less: deferred financing costs				27,997						26,049
			$	4,027,947					$	3,578,632