Fair Value of Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2019

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, 2019 and December 31, 2018 (in thousands):

			Estimated Fair Value Measurements at June 30, 2019
	Carrying Value as of June 30, 2019		Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	21,561	$	21,561	$	21,561	$	—	$	—
Restricted cash and investments	57,993		57,993		57,993		—		—
Liabilities:
Borrowings under senior credit facility	$	1,231,322	$	1,206,589	$	—	$	1,206,589	$	—
5.875% Senior Notes due 2022	250,000		247,275		—		247,275		—
5.125% Senior Notes due 2023	300,000		269,220		—		269,220		—
5.875% Senior Notes due 2024	250,000		221,240		—		221,240		—
6.00% Senior Notes due 2026	350,000		305,620		—		305,620		—
Non-recourse debt	342,233		339,188		—		339,188		—

			Estimated Fair Value Measurements at December 31, 2018
	Carrying Value as of December 31, 2018		Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	31,255	$	31,255	$	31,255	$	—	$	—
Restricted cash and investments	53,217		53,217		50,499		2,718		—
Liabilities:
Borrowings under senior credit facility	$	1,273,965	$	1,188,196	$	—	$	1,188,196	$	—
5.875% Senior Notes due 2022	250,000		244,550		—		244,550		—
5.125% Senior Notes due 2023	300,000		271,992		—		271,992		—
5.875% Senior Notes due 2024	250,000		224,590		—		224,590		—
6.00% Senior Notes due 2026	350,000		310,177		—		310,177		—
Non-recourse debt	340,910		348,274		—		348,274		—