Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Tax Expense Components [Line Items]
Income before income taxes	$ 27,980	$ 28,351	$ 82,985	$ 76,444
Income tax expense	8,289	8,652	24,805	23,716
Net income from continuing operations	19,691	19,699	$ 58,180	$ 52,728
Effective Income Tax Rate, Continuing Operations			29.90%	31.00%
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax			$ 6,631	$ 7,432
Discontinued Operation, Tax Effect of Discontinued Operation			2,750	3,075
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	1,186	1,047	$ 3,881	$ 4,357
Effective Tax Rate Discontinued Operations			41.50%	41.40%
Tax effect Attributable to Noncontrolling Interests			$ 0	$ 0
Net income attributable to noncontrolling interests	1,074	1,110	$ 3,190	$ 3,010
Effective Tax Rate Noncontrolling Interests			0.00%	0.00%
Income from Continuing and Discontinued Operations Attributable to Parent Before Tax			$ 86,426	$ 80,866
Tax Expense (Benefit) Total			27,555	26,791
Net income attributable to the Company	$ 19,803	$ 19,636	$ 58,871	$ 54,075
Effective Tax Rate Total			31.90%	33.10%