Acquisitions - Arminak & Associates Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Redeemable Noncontrolling Interest [Line Items]
Net income attributable to noncontrolling interest	$ 0	$ 0	$ 0	$ 810	$ 0	$ 810	$ 4,520
Noncontrolling Interest, Change in Redemption Value							(890)
Fair Value, Inputs, Level 3 [Member]
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest				29,710			29,480	$ 26,780
Business Acquisition, Arminak & Associates [Member]
Redeemable Noncontrolling Interest [Line Items]
Distributions to noncontrolling interests				(580)			(2,710)
Net income attributable to noncontrolling interest				$ 810			4,520
Noncontrolling Interest, Change in Redemption Value							$ 890