Geographic Information (Revenue by Geographic Locations) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) Reportable_Segments	Mar. 31, 2015 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Reportable_Segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
Document Period End Date	Mar. 31, 2016
Revenue, Net, Increase (Decrease)	$ 7,313
External Revenues	71,066	$ 63,753
Long-lived assets	558,146	530,233
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	52,796	48,537
Long-lived assets	372,004	384,092
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	847	685
Long-lived assets	6,968	7,164
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,137	1,496
Long-lived assets	6,708	7,708
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	7,792	8,678
Long-lived assets	171	524
Effect of Exchange Rate on Revenue	(700)
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Effect of Exchange Rate on Revenue	(400)
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,434	1,047
Long-lived assets	68,718	68,493
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	391	578
Long-lived assets	221	319
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)	1,500
External Revenues	2,026	989
Long-lived assets	76,789	37,426
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	4,643	1,743
Long-lived assets	$ 26,567	$ 24,507