Fair Value of Assets and Liabilities (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2018 and December 31, 2017 (in thousands):

			Estimated Fair Value Measurements at March 31, 2018
	Carrying Value as of March 31, 2018		Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	49,235	$	49,235	$	49,235	$	—	$	—
Restricted cash and investments	60,014		60,014		57,289		2,725		—
Liabilities:
Borrowings under senior credit facility	$	1,122,155	$	1,122,155	$	—	$	1,122,155	$	—
5.875% Senior Notes due 2024	250,000		250,505		—		250,505		—
5.125% Senior Notes	300,000		297,888		—		297,888		—
5.875% Senior Notes due 2022	250,000		257,330		—		257,330		—
6.00% Senior Notes	350,000		344,467		—		344,467		—
Non-recourse debt	382,647		383,462		—		383,462		—

			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		—