Annual report pursuant to Section 13 and 15(d)

Accounting Policies amortization of leased assets (Details)

v2.4.0.8
Accounting Policies amortization of leased assets (Details) (Leases, Acquired-in-Place [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leases, Acquired-in-Place [Member]
     
Acquired Indefinite-lived Intangible Assets [Line Items]      
Amortization of Leased Asset $ 17,290 $ 19,573 $ 13,704