Fair Value of Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Carrying value and estimated fair value of financial instruments

The following tables present the carrying values of those financial instruments and the estimated corresponding fair values at June 30, 2018 and December 31, 2017 (in thousands):

			Estimated Fair Value Measurements at June 30, 2018
	Carrying Value as of June 30, 2018		Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	65,451	$	65,451	$	65,451	$	—	$	—
Restricted cash and investments	61,764		61,764		59,794		1,970		—
Liabilities:
Borrowings under senior credit facility	$	1,170,968	$	1,175,906	$	—	$	1,175,906	$	—
5.875% Senior Notes due 2024	250,000		246,553		—		246,553		—
5.125% Senior Notes	300,000		294,009		—		294,009		—
5.875% Senior Notes due 2022	250,000		253,740		—		253,740		—
6.00% Senior Notes	350,000		339,493		—		339,493		—
Non-recourse debt	368,143		368,929		—		368,929		—

			Estimated Fair Value Measurements at December 31, 2017
	Carrying Value as of December 31, 2017		Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	81,377	$	81,377	$	81,377	$	—	$	—
Restricted cash and investments	52,168		52,168		49,884		2,284		—
Liabilities:
Borrowings under senior credit facility	$	1,064,599	$	1,070,514	$	—	$	1,070,514	$	—
5.875% Senior Notes due 2024	250,000		262,095		—		262,095		—
5.125% Senior Notes	300,000		303,918		—		303,918		—
5.875% Senior Notes due 2022	250,000		258,338		—		258,338		—
6.00% Senior Notes	350,000		362,835		—		362,835		—
Non-recourse debt	393,737		394,671		—		394,671		—