Geographic Information (Revenue by Geographic Locations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Reportable_Segments	Jun. 30, 2012
Segment Reporting [Abstract]
Number of reportable segments			1
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 51,004	$ 47,716	$ 103,570	$ 91,543
Long-lived assets	456,195	420,877	456,195	420,877
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			70,898	64,726
Long-lived assets	320,353	315,847	320,353	315,847
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			3,381	2,253
Long-lived assets	9,103	8,925	9,103	8,925
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,786	4,338
Long-lived assets	11,535	12,632	11,535	12,632
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			19,840	17,557
Long-lived assets	1,007	1,401	1,007	1,401
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			1,383	1,620
Long-lived assets	69,580	71,456	69,580	71,456
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			1,161	1,026
Long-lived assets	209	240	209	240
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			371	23
Long-lived assets	19,388	10,376	19,388	10,376
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			3,750	0
Long-lived assets	$ 25,020	$ 0	$ 25,020	$ 0