Segment Information (Financial Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Operating Revenues	$ 459,538	$ 488,401	$ 877,246	$ 933,301
Depreciation and Amortization	47,106	47,347	96,325	93,487
Operating Income/(Loss)	14,590	89,637	35,794	134,056
Equity in (Losses)/Earnings of Affiliates, Net of Tax	314	2,837	(108)	3,070
Net Income/(Loss) From Continuing Operations	(5,524)	58,532	(3,791)	86,894
Capital Expenditures	30,054	20,483	63,021	39,967
Assets	4,149,875		4,149,875		$ 4,168,361
PIRM
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	2,200	1,700	4,000	3,200
Segment reporting intercompany expense	1,000	800	1,800	1,600
UWS
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	1,000	800	1,800	1,600
Segment reporting intercompany expense	2,200	1,700	4,000	3,200
Operating Segments | PIRM
Segment Reporting Information [Line Items]
Operating Revenues	183,717	182,655	359,525	356,422
Depreciation and Amortization	26,113	25,463	52,912	51,198
Operating Income/(Loss)	23,026	28,974	37,378	49,752
Equity in (Losses)/Earnings of Affiliates, Net of Tax	482	3,740	(42)	4,011
Net Income/(Loss) From Continuing Operations	19,272	32,295	30,659	52,966
Capital Expenditures	14,290	13,917	29,903	27,123
Assets	1,947,601		1,947,601		1,953,732
Operating Segments | UWS
Segment Reporting Information [Line Items]
Operating Revenues	279,017	308,226	523,535	581,645
Depreciation and Amortization	13,757	16,483	29,532	31,447
Operating Income/(Loss)	19,779	85,897	65,631	133,950
Equity in (Losses)/Earnings of Affiliates, Net of Tax	(8)	(10)	(8)	8
Net Income/(Loss) From Continuing Operations	20,377	85,868	65,812	133,622
Capital Expenditures	4,861	2,386	10,629	4,699
Assets	2,162,222		2,162,222		2,200,292
Corporate
Segment Reporting Information [Line Items]
Operating Revenues	0	0	0	0
Depreciation and Amortization	7,236	5,401	13,881	10,842
Operating Income/(Loss)	(28,215)	(25,234)	(67,215)	(49,646)
Equity in (Losses)/Earnings of Affiliates, Net of Tax	(160)	(893)	(58)	(949)
Net Income/(Loss) From Continuing Operations	(45,173)	(59,631)	(100,262)	(99,694)
Capital Expenditures	10,903	4,180	22,489	8,145
Assets	6,021,103		6,021,103		5,995,787
Eliminations
Segment Reporting Information [Line Items]
Operating Revenues	(3,196)	(2,480)	(5,814)	(4,766)
Depreciation and Amortization	0	0	0	0
Operating Income/(Loss)	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
Capital Expenditures	0	$ 0	0	$ 0
Assets	$ (5,981,051)		$ (5,981,051)		$ (5,981,450)