Geographic Information (Revenue by Geographic Locations) (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($) Reportable_Segments	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | Reportable_Segments			1
Revenues from External Customers and Long-Lived Assets [Line Items]
Document Period End Date			Jun. 30, 2016
Revenue, Net, Increase (Decrease)	$ 7,862
External Revenues	72,574	$ 64,712	$ 143,640	$ 128,465
Long-lived assets	562,537	556,592	562,537	556,592	$ 562,537
Increase (Decrease) in Deferred Income Taxes			6,635	6,014
Goodwill, Transfers			0			$ (1,783)
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			103,171	98,052
Long-lived assets	371,507	406,544	371,507	406,544	371,507
Long Lived Assets, Increase (Decrease)					(35,000)
Goodwill, Transfers					(28,800)
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,950	2,210
Long-lived assets	6,941	7,270	6,941	7,270	6,941
Latin America
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,425	3,000
Long-lived assets	7,429	7,936	7,429	7,936	7,429
Australia
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			15,550	16,294
Long-lived assets	627	497	627	497	627
Effect of Exchange Rate on Revenue			(1,000)
BRAZIL
Revenues from External Customers and Long-Lived Assets [Line Items]
Effect of Exchange Rate on Revenue			(600)
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			2,957	2,421
Long-lived assets	34,008	68,668	34,008	68,668	34,008
Long Lived Assets, Increase (Decrease)					(34,700)
New Zealand
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			876	1,209
Long-lived assets	224	287	224	287	224
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue, Net, Increase (Decrease)			4,600
External Revenues			6,307	1,719
Long-lived assets	79,524	39,636	79,524	39,636	79,524
Long Lived Assets, Increase (Decrease)					39,900
Increase (Decrease) in Deferred Income Taxes					5,700
Goodwill, Transfers					28,800
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			9,404	3,560
Long-lived assets	24,334	25,754	24,334	25,754	24,334
Dubai [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
External Revenues			0	0
Long-lived assets	$ 37,943	$ 0	$ 37,943	$ 0	37,943
Long Lived Assets, Increase (Decrease)					$ 37,900