Segment Information (Total Assets by Segment) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 915,150	$ 917,547
Healthcare [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	415,917	405,283
Energy [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	133,766	130,052
Financial Services Advisory and Compliance [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	81,508	85,250
Unallocated Assets [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 283,959	$ 296,962