Geographic Information (Revenue by Geographic Locations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 Reportable_Segments	Mar. 31, 2013
Segment Reporting [Abstract]
Number of reportable segments	1
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	$ 51,404	$ 52,566
Long-lived assets	446,547	439,929
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	34,800	36,232
Long-lived assets	304,070	317,727
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,437	1,657
Long-lived assets	8,442	9,467
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,482	1,303
Long-lived assets	11,282	12,840
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	9,729	10,518
Long-lived assets	785	1,195
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	1,144	724
Long-lived assets	68,693	69,878
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	650	526
Long-lived assets	99	235
India
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	110	218
Long-lived assets	24,795	17,364
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues	2,052	1,388
Long-lived assets	$ 28,381	$ 11,223