Income Taxes (Components of income tax expense (benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Abstract]
Current Income Tax Expense Benefit	$ 33,618	$ 19,101	$ 2,768
Deferred Income Tax Expense (Benefit)	14,772	(3,658)	23,226
Total Income Tax Expense (Benefit)	$ 48,390	$ 15,443	$ 25,994

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration