Geographic Information (Revenue by Geographic Locations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 Reportable_Segments	Sep. 30, 2013
Segment Reporting [Abstract]
Number of reportable segments			1
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 50,808	$ 50,293	$ 153,688	$ 153,863
Long-lived assets	470,187	448,885	470,187	448,885
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			103,225	105,471
Long-lived assets	316,810	310,481	316,810	310,481
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			4,206	4,977
Long-lived assets	8,233	9,247	8,233	9,247
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			4,961	4,205
Long-lived assets	10,391	11,488	10,391	11,488
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			28,247	28,955
Long-lived assets	652	817	652	817
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			3,194	2,301
Long-lived assets	68,113	69,281	68,113	69,281
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,008	1,702
Long-lived assets	77	107	77	107
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			1,112	540
Long-lived assets	38,625	19,319	38,625	19,319
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			6,735	5,712
Long-lived assets	$ 27,286	$ 28,145	$ 27,286	$ 28,145