Income Taxes - Net Operating Loss Expirations (Details) $ in Thousands	Dec. 31, 2019 USD ($)
US Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	$ 452,511
US Federal | 2030
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US Federal | 2031
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US Federal | 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US Federal | 2033
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	2,225
US Federal | 2034
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	7,276
US Federal | 2035
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	53,359
US Federal | 2036
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	23,379
US Federal | 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	65,509
US Federal | 2038
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US Federal | 2039
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US Federal | Does not expire
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	300,763
US State
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	81,161
US State | 2030
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US State | 2031
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US State | 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US State | 2033
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	2,232
US State | 2034
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	22,162
US State | 2035
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	52,950
US State | 2036
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US State | 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US State | 2038
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	3,817
US State | 2039
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
US State | Does not expire
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
Canadian Federal
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	79,053
Canadian Federal | 2030
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	4,830
Canadian Federal | 2031
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	7,059
Canadian Federal | 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	13,308
Canadian Federal | 2033
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	18,623
Canadian Federal | 2034
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	32,401
Canadian Federal | 2035
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	1,084
Canadian Federal | 2036
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	777
Canadian Federal | 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	697
Canadian Federal | 2038
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
Canadian Federal | 2039
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	274
Canadian Federal | Does not expire
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
Canadian Provincial
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	78,432
Canadian Provincial | 2030
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	4,907
Canadian Provincial | 2031
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	7,066
Canadian Provincial | 2032
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	12,433
Canadian Provincial | 2033
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	19,385
Canadian Provincial | 2034
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	31,809
Canadian Provincial | 2035
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	1,084
Canadian Provincial | 2036
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	777
Canadian Provincial | 2037
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	697
Canadian Provincial | 2038
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	0
Canadian Provincial | 2039
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	274
Canadian Provincial | Does not expire
Operating Loss Carryforwards [Line Items]
Net operating loss carry forwards (NOLs)	$ 0