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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Equity securities at fair value $ 9,651 $ 0
Marketable equity securities   9,720
Level 1    
Assets    
Equity securities at fair value 9,651  
Liabilities    
Interest rate swap agreements 0  
Level 2    
Assets    
Equity securities at fair value 0  
Liabilities    
Interest rate swap agreements 0  
Level 3    
Assets    
Equity securities at fair value 0  
Liabilities    
Interest rate swap agreements 16  
Recurring    
Assets    
Equity securities at fair value 9,651  
Marketable equity securities   9,720
Total assets 23,408 18,718
Liabilities    
Interest rate swap agreements 13,475 8,890
Recurring | Level 1    
Assets    
Equity securities at fair value 9,651  
Marketable equity securities   9,720
Total assets 9,651 9,720
Liabilities    
Interest rate swap agreements 0 0
Recurring | Level 2    
Assets    
Equity securities at fair value 0  
Marketable equity securities   0
Total assets 13,350 8,766
Liabilities    
Interest rate swap agreements 13,338 8,785
Recurring | Level 3    
Assets    
Equity securities at fair value 0  
Marketable equity securities   0
Total assets 407 232
Liabilities    
Interest rate swap agreements 137 105
Interest rate swap agreements | Level 1    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Interest rate swap agreements | Level 2    
Assets    
Interest rate swap agreements 13,350 8,766
Liabilities    
Interest rate swap agreements 13,338 8,785
Interest rate swap agreements | Level 3    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Interest rate swap agreements | Recurring    
Assets    
Interest rate swap agreements 13,350 8,766
Liabilities    
Interest rate swap agreements 13,338 8,785
Interest rate swap agreements | Recurring | Level 1    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Interest rate swap agreements | Recurring | Level 2    
Assets    
Interest rate swap agreements 13,350 8,766
Liabilities    
Interest rate swap agreements 13,338 8,785
Interest rate swap agreements | Recurring | Level 3    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Forward loan sale commitments-best efforts | Level 1    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Forward loan sale commitments-best efforts | Level 2    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Forward loan sale commitments-best efforts | Level 3    
Assets    
Interest rate swap agreements 30 22
Liabilities    
Interest rate swap agreements 66 69
Forward loan sale commitments-best efforts | Recurring    
Assets    
Interest rate swap agreements 30 22
Liabilities    
Interest rate swap agreements 66 69
Forward loan sale commitments-best efforts | Recurring | Level 1    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Forward loan sale commitments-best efforts | Recurring | Level 2    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Forward loan sale commitments-best efforts | Recurring | Level 3    
Assets    
Interest rate swap agreements 30 22
Liabilities    
Interest rate swap agreements 66 69
Forward loan sale commitments mandatory delivery | Level 1    
Liabilities    
Interest rate swap agreements 0  
Forward loan sale commitments mandatory delivery | Level 2    
Liabilities    
Interest rate swap agreements 0  
Forward loan sale commitments mandatory delivery | Level 3    
Liabilities    
Interest rate swap agreements 55  
Forward loan sale commitments mandatory delivery | Recurring    
Liabilities    
Interest rate swap agreements 55  
Forward loan sale commitments mandatory delivery | Recurring | Level 1    
Liabilities    
Interest rate swap agreements 0  
Forward loan sale commitments mandatory delivery | Recurring | Level 2    
Liabilities    
Interest rate swap agreements 0  
Forward loan sale commitments mandatory delivery | Recurring | Level 3    
Liabilities    
Interest rate swap agreements 55  
Mortgage loan commitments best efforts | Level 1    
Assets    
Interest rate swap agreements 0  
Mortgage loan commitments best efforts | Level 2    
Assets    
Interest rate swap agreements 0  
Mortgage loan commitments best efforts | Level 3    
Assets    
Interest rate swap agreements 206  
Mortgage loan commitments best efforts | Recurring    
Assets    
Interest rate swap agreements 206 210
Liabilities    
Interest rate swap agreements 16 36
Mortgage loan commitments best efforts | Recurring | Level 1    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Mortgage loan commitments best efforts | Recurring | Level 2    
Assets    
Interest rate swap agreements 0 0
Liabilities    
Interest rate swap agreements 0 0
Mortgage loan commitments best efforts | Recurring | Level 3    
Assets    
Interest rate swap agreements 206 210
Liabilities    
Interest rate swap agreements 16 $ 36
Mortgage loan commitments mandatory delivery | Level 3    
Assets    
Interest rate swap agreements 171  
Mortgage loan commitments mandatory delivery | Recurring    
Assets    
Interest rate swap agreements 171  
Mortgage loan commitments mandatory delivery | Recurring | Level 1    
Assets    
Interest rate swap agreements 0  
Mortgage loan commitments mandatory delivery | Recurring | Level 2    
Assets    
Interest rate swap agreements 0  
Mortgage loan commitments mandatory delivery | Recurring | Level 3    
Assets    
Interest rate swap agreements $ 171