Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Measurements

Recurring fair value measurements

	Fair Value as of December 31, 2018
	Level 1		Level 2		Level 3
	(In thousands)
Assets:
Short-term investments:
Equity securities	$	33,250	$	778	$	—
Mortgage-CMO debt securities		—		8		—
Total short-term investments	$	33,250	$	786	$	—

	Fair Value as of December 31, 2017
	Level 1		Level 2		Level 3
	(In thousands)
Assets:
Short-term investments:
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,
				2018							2017
	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
9.25% senior notes due January 2019	—	%		—		—	9.77	%		303,489			321,028
5.00% senior notes due September 2020	5.25	%		614,748		590,336	5.43	%		669,846			670,757
4.625% senior notes due September 2021	4.75	%		668,347		603,457	4.76	%		695,108			665,003
5.50% senior notes due January 2023	5.84	%		586,000		465,999	5.85	%		600,000			584,850
5.10% senior notes due September 2023	5.26	%		342,923		262,494	5.28	%		346,576			325,844
0.75% senior exchangeable notes due January 2024	6.04	%		450,689		358,012	5.90	%		429,982			443,940
5.75% senior notes due February 2025	5.87	%		791,502		598,953	—	%		—			—
2012 Revolving credit facility	3.58	%		170,000		170,000	2.73	%		510,000			510,000
2018 Revolving credit facility	—	%		—		—	—	%		—			—
Commercial paper	—	%		—		—	1.87	%		40,000			40,000
Other	—	%		561		561	—	%		181			181
				3,624,770	$	3,049,812				4,055,944		$	4,024,277
Less: current portion				561						181
Less: deferred financing costs				38,325						27,997
			$	3,585,884					$	4,027,766