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Property, Plant and Equipment - Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]                  
Property, plant, and equipment, gross $ 246,061 $ 239,247 $ 229,951 $ 220,685 $ 185,721 $ 182,990 $ 178,683 $ 129,492 $ 125,423
Accumulated depreciation (87,086) (81,467) (76,589) (72,756) (67,937) (64,829) (60,027) (56,455) (54,470)
Property Plant And Equipment After Depreciation Before Construction In Progress 158,975       117,784        
Construction in progress 20,639       26,412        
Property, Plant and Equipment, Net 179,614 177,433 179,239 175,991 144,196 139,374 135,464 87,675 82,108
Land [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant, and equipment, gross 17,409 17,351 17,762 17,721 9,323 9,395 8,678 2,686 2,606
Building and Building Improvements [Member]                  
Property, Plant and Equipment [Line Items]                  
Property, plant, and equipment, gross 85,767 84,767 79,954 79,216 63,846 61,468 60,474 48,653 46,281
Furniture and Fixtures                  
Property, Plant and Equipment [Line Items]                  
Property, plant, and equipment, gross $ 142,885 $ 137,129 $ 132,235 $ 123,748 $ 112,552 $ 112,127 $ 109,531 $ 78,153 $ 76,536