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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule Of Roll Forward Activity In Insurance Reserves [Table Text Block]
While recorded accruals are based on the ultimate liability, which includes amounts in excess of the deductible, a corresponding receivable for amounts in excess of the stop loss deductible is included in current assets in the consolidated balance sheets at December 31:
 
 
 
 
(in thousands)
 
2015
 
2014
 
2013
Balance at beginning of period
 
$
39,480
 
 
$
39,111
 
 
$
39,583
 
Net increases in reserves
 
 
15,686
 
 
 
16,220
 
 
 
16,861
 
Net payments made
 
 
(18,199
) 
 
 
(15,851
) 
 
 
(17,333
) 
Balance at end of period
 
$
36,967
 
 
$
39,480
 
 
$
39,111