Debt (Narrative) (Canadian Credit Facilities) (Details)												6 Months Ended
	Jun. 30, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2014 Canadian Credit Facilities (Facility C) USD ($)	Jun. 30, 2013 Canadian Credit Facilities (Facility C) CAD	Jun. 30, 2014 Canadian Credit Facilities (Facility B) USD ($)	Jun. 30, 2013 Canadian Credit Facilities (Facility B) CAD	Jun. 30, 2014 Canadian Credit Facilities (Facility A) USD ($)	Jun. 30, 2013 Canadian Credit Facilities (Facility A) CAD	Jun. 30, 2014 Term Credit Facilities [Member] USD ($)	Jun. 30, 2013 Term Credit Facilities [Member] CAD	Jun. 30, 2011 Term Credit Facilities [Member] USD ($)	Jun. 30, 2014 Base Rate Plus Funds Borrowed in USD [Member] Minimum [Member] Canadian Credit Facilities (Facility C)	Jun. 30, 2014 Base Rate Plus Funds Borrowed in USD [Member] Maximum [Member] Canadian Credit Facilities (Facility C)	Jun. 30, 2014 Base Rate Plus Funds Borrowed in CAD [Member] Canadian Credit Facilities (Facility B)	Jun. 30, 2014 Base Rate Plus Funds Borrowed in CAD [Member] Minimum [Member] Canadian Credit Facilities (Facility C)	Jun. 30, 2014 Base Rate Plus Funds Borrowed in CAD [Member] Maximum [Member] Canadian Credit Facilities (Facility C)	Jun. 30, 2014 Base Rate Plus Funds Borrowed in USD or CAD [Member] Canadian Credit Facilities (Facility A)	Jun. 30, 2014 LIBOR Plus Funds Borrowed In USD [Member] Canadian Credit Facilities (Facility A)	Jun. 30, 2014 LIBOR Plus Funds Borrowed In USD [Member] Minimum [Member] Canadian Credit Facilities (Facility C)	Jun. 30, 2014 LIBOR Plus Funds Borrowed In USD [Member] Maximum [Member] Canadian Credit Facilities (Facility C)
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity				10,000,000		2,000,000		10,000,000		22,000,000	$ 20,600,000
Canadian facilities secured by a first-ranking lien										30,000,000
Interest rate spread												1.00%	1.25%	1.00%	1.00%	1.25%	0.50%	2.00%	2.00%	2.25%
Credit facility amount outstanding	$ 1,436,000	$ 795,000	$ 6,500,000		$ 1,000,000		$ 0		$ 7,500,000