Enterprise-Wide Disclosures - (Tables)

12 Months Ended

Dec. 31, 2014

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Financial Information About Geographic Areas	2014		2013		2012
(amounts in thousands)
Revenue from External Customers:
United States	$	314,500	$	341,391	$	355,022
Belgium(1)	44,692		48,428		41,957
Other European countries	33,652		28,684		26,653
Other country	424		533		783
Total foreign revenue	78,768		77,645		69,393
Total revenue	$	393,268	$	419,036	$	424,415
Long-lived Assets:
United States	$	5,759	$	7,169	$	6,102
Europe	1,034		1,072		814
Total long-lived assets	$	6,793	$	8,241	$	6,916
Deferred Tax Assets, Net of Valuation Allowance:
United States	$	7,982	$	8,669	$	8,485
Europe	56		—		—
Total deferred tax assets, net	$	8,038	$	8,669	$	8,485

(1) Revenue for our Belgium operations has been disclosed separately as it exceeds 10% of consolidated revenue for certain of the years presented