Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current deferred tax assets
Provisions not currently deductible	$ 8,962	$ 4,002
Tax credits and deferred revenues	74	0
Net operating loss —state	24	112
Total current deferred tax asset	9,060	4,114
Non-current deferred tax assets
Provisions not currently deductible	308	4,046
Stock based compensation	270	2,739
Net operating loss carryforwards—federal and state	189	211
Net capital loss carryforwards—federal and state	1,988	0
Pensions and post retirement	1,603	4,229
Total non-current deferred tax asset	4,358	11,225
Valuation allowance	0	(1)
Total non-current deferred tax asset	4,358	11,224
Total deferred tax asset	13,418	15,338
Non-current deferred tax liabilities
Investment in joint ventures/partnerships	(2,294)	(3,256)
Property, plant and equipment	(101,276)	(60,775)
Unrealized gain on financial instruments	0	(653)
Other	0	(6)
Total deferred tax liability	$ (103,570)	$ (64,690)