Income Taxes (Statutory Tax Rate Impact on Income Tax Expense) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory income tax rate	35.00%	35.00%	35.00%
“Expected” statutory tax (expense) benefit	$ 3,430,000	$ (1,891,000)	$ 3,482,000
Tax reform rate change	43,484,000	0	0
Employee's excess tax benefit for stock based compensation	3,397,000	0	0
Nondeductible officer compensation	(1,439,000)	(1,424,000)	(1,906,000)
Nondeductible transaction costs	(2,760,000)	0	0
Nondeductible entertainment expenses	(1,141,000)	(1,029,000)	(1,059,000)
Nondeductible lobbying expenses	(345,000)	(1,192,000)	(442,000)
State income taxes, net of federal (expense) benefit	(420,000)	(1,022,000)	209,000
Impact of non-controlling interest attributable to non-tax paying entity	0	0	220,000
Other, net	(3,089,000)	(522,000)	(585,000)
Income tax (expense) benefit	$ 41,117,000	$ (7,080,000)	$ (81,000)