Segment Information (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues	$ 458,957	$ 451,768	$ 1,336,203	$ 1,385,069
Depreciation and Amortization	45,717	48,461	142,042	141,948
Operating Income/(Loss)	73,700	59,780	109,494	193,836
Equity in (Losses)/Earnings of Affiliates, Net of Tax	605	(161)	497	2,909
Net Income/(Loss) From Continuing Operations	40,545	22,535	36,754	109,429
Capital Expenditures	29,618	26,066	92,639	66,033
Assets	4,132,107		4,132,107		$ 4,168,361
PIRM
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	2,700	1,700	6,700	4,900
Segment reporting intercompany expense	800	700	2,600	2,300
UWS
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	800	700	2,600	2,300
Segment reporting intercompany expense	2,700	1,700	6,700	4,900
Operating Segments | PIRM
Segment Reporting Information [Line Items]
Operating Revenues	181,649	180,607	541,174	537,029
Depreciation and Amortization	25,015	26,143	77,927	77,341
Operating Income/(Loss)	23,443	22,978	60,821	72,730
Equity in (Losses)/Earnings of Affiliates, Net of Tax	762	(168)	720	3,843
Net Income/(Loss) From Continuing Operations	27,197	24,242	57,856	77,208
Capital Expenditures	12,221	12,200	42,124	39,323
Assets	1,906,138		1,906,138		1,953,732
Operating Segments | UWS
Segment Reporting Information [Line Items]
Operating Revenues	280,828	273,625	804,363	855,270
Depreciation and Amortization	13,012	16,402	42,544	47,849
Operating Income/(Loss)	77,758	61,850	143,389	195,800
Equity in (Losses)/Earnings of Affiliates, Net of Tax	(4)	(12)	(12)	(4)
Net Income/(Loss) From Continuing Operations	74,803	61,621	140,615	195,243
Capital Expenditures	2,319	3,151	12,948	7,850
Assets	2,170,041		2,170,041		2,200,292
Corporate
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0	0
Depreciation and Amortization	7,690	5,916	21,571	16,758
Operating Income/(Loss)	(27,501)	(25,048)	(94,716)	(74,694)
Equity in (Losses)/Earnings of Affiliates, Net of Tax	(153)	19	(211)	(930)
Net Income/(Loss) From Continuing Operations	(61,455)	(63,328)	(161,717)	(163,022)
Capital Expenditures	15,078	10,715	37,567	18,860
Assets	6,056,340		6,056,340		5,995,787
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(3,520)	(2,464)	(9,334)	(7,230)
Depreciation and Amortization	0	0	0	0
Operating Income/(Loss)	0	0	0	0
Equity in (Losses)/Earnings of Affiliates, Net of Tax	0	0	0	0
Net Income/(Loss) From Continuing Operations	0	0	0	0
Capital Expenditures	0	$ 0	0	$ 0
Assets	$ (6,000,412)		$ (6,000,412)		$ (5,981,450)