Geographic Information (Revenue by Geographic Locations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Reportable_Segments	Sep. 30, 2012
Segment Reporting [Abstract]
Number of reportable segments			1
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 50,293	$ 53,804	$ 153,863	$ 145,347
Long-lived assets	448,885	439,407	448,885	439,407
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			105,471	103,086
Long-lived assets	310,481	320,124	310,481	320,124
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			4,977	4,207
Long-lived assets	9,247	9,290	9,247	9,290
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			4,205	6,266
Long-lived assets	11,488	12,908	11,488	12,908
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			28,955	27,039
Long-lived assets	817	1,542	817	1,542
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,301	2,165
Long-lived assets	69,281	71,180	69,281	71,180
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			1,702	1,624
Long-lived assets	107	245	107	245
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			540	147
Long-lived assets	19,319	10,422	19,319	10,422
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			5,712	813
Long-lived assets	$ 28,145	$ 13,696	$ 28,145	$ 13,696