Segment Information - Summary of Segment Financial Information Relating to Operations (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating revenue:
Total operating revenue	$ 623,283	$ 490,304	$ 422,633	$ 258,854	$ 473,221	$ 342,628	$ 325,059	$ 261,295	$ 1,796,528	$ 1,406,040	$ 1,104,052
Income before provision from income taxes:
Income before extinguishment of debt									142,512	102,817	87,067
Corporate - Loss on extinguishment of debt									(21,828)	0	0
Income before provision for income taxes									120,684	102,817	87,067
California
Operating revenue:
Total operating revenue									682,896	494,189	401,934
Income before provision from income taxes:
Income before extinguishment of debt									88,422	47,692	46,752
Arizona
Operating revenue:
Total operating revenue									158,534	125,951	69,510
Income before provision from income taxes:
Income before extinguishment of debt									14,832	12,004	5,743
Nevada
Operating revenue:
Total operating revenue									176,354	191,711	130,845
Income before provision from income taxes:
Income before extinguishment of debt									15,672	19,182	13,022
Colorado
Operating revenue:
Total operating revenue									124,456	128,530	107,014
Income before provision from income taxes:
Income before extinguishment of debt									7,156	6,978	3,291
Washington
Operating revenue:
Total operating revenue									333,667	154,600	181,258
Income before provision from income taxes:
Income before extinguishment of debt									30,008	9,528	18,652
Oregon
Operating revenue:
Total operating revenue									320,621	311,059	213,491
Income before provision from income taxes:
Income before extinguishment of debt									35,862	41,617	24,787
Corporate
Income before provision from income taxes:
Income before extinguishment of debt									(49,440)	(34,184)	(25,180)
Corporate - Loss on extinguishment of debt									$ (21,828)	$ 0	$ 0