Fair Value of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Carrying value and estimated fair value of financial instruments

The Company’s Consolidated Balance Sheets reflect certain financial instruments at carrying value. The following table presents the carrying values of those instruments and the corresponding estimated fair values (in thousands):

	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	$	1,064,559	$	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		—

	Estimated Fair Value Measurements at December 31, 2016
	Carrying Value as of December 31, 2016		Total Fair Value		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	68,038	$	68,038	$	68,038	$	—	$	—
Restricted cash	22,319		22,319		19,614		2,705		—
Liabilities:
Borrowings under Senior Credit Facility	$	804,500	$	795,008	$	—	$	795,008	$	—
5.875% Senior Notes due 2024	250,000		247,813		—		247,813		—
5.125% Senior Notes	300,000		292,125		—		292,125		—
5.875% Senior Notes due 2022	250,000		254,688		—		254,688		—
6.00% Senior Notes	350,000		346,938		—		346,938		—
Non-recourse debt	490,502		491,735		—		491,735		—