Segment Information (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues	$ 417,708	$ 444,900
Depreciation and Amortization	49,219	46,140
Operating Income/(Loss)	21,204	44,419
Equity in (Losses)/Earnings of Affiliates, Net of Tax	(422)	233
Net Income/(Loss) From Continuing Operations	1,733	28,362
Capital Expenditures	32,967	19,484
Assets	4,213,297		$ 4,168,361
PIRM
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	1,800	1,500
Segment reporting intercompany expense	800	758
UWS
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	800	800
Segment reporting intercompany expense	1,800	1,500
Operating Segments \| PIRM
Segment Reporting Information [Line Items]
Operating Revenues	175,808	173,767
Depreciation and Amortization	26,799	25,735
Operating Income/(Loss)	14,352	20,778
Equity in (Losses)/Earnings of Affiliates, Net of Tax	(524)	271
Net Income/(Loss) From Continuing Operations	11,387	20,671
Capital Expenditures	15,613	13,206
Assets	1,952,296		1,953,732
Operating Segments \| UWS
Segment Reporting Information [Line Items]
Operating Revenues	244,518	273,419
Depreciation and Amortization	15,775	14,964
Operating Income/(Loss)	45,852	48,053
Equity in (Losses)/Earnings of Affiliates, Net of Tax	0	18
Net Income/(Loss) From Continuing Operations	45,435	47,754
Capital Expenditures	5,768	2,313
Assets	2,206,404		2,200,292
Corporate
Segment Reporting Information [Line Items]
Operating Revenues	0	0
Depreciation and Amortization	6,645	5,441
Operating Income/(Loss)	(39,000)	(24,412)
Equity in (Losses)/Earnings of Affiliates, Net of Tax	102	(56)
Net Income/(Loss) From Continuing Operations	(55,089)	(40,063)
Capital Expenditures	11,586	3,965
Assets	6,035,802		5,995,787
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(2,618)	(2,286)
Depreciation and Amortization	0	0
Operating Income/(Loss)	0	0
Equity in (Losses)/Earnings of Affiliates, Net of Tax	0	0
Net Income/(Loss) From Continuing Operations	0	0
Capital Expenditures	0	$ 0
Assets	$ (5,981,205)		$ (5,981,450)

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