Quarterly Information (Unaudited) - Schedule of Quarterly Information (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended								12 Months Ended
	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, 2015	Dec. 31, 2014	Dec. 31, 2013
Condensed Income Statements, Captions [Line Items]
Revenue	$ 354,400	$ 273,300	$ 254,600	$ 225,000	$ 295,400	$ 243,200	$ 247,600	$ 198,000	$ 1,107,300	$ 984,200	$ 934,200
Cost of sales	252,500	197,100	180,400	160,500	217,600	177,700	178,800	145,400
Income (loss) from continuing operations	20,900	12,700	14,400	8,000	15,100	9,000	11,400	(4,700)	56,000	30,800	34,000
Income (loss) from discontinued operations, net of tax	0	(100)	0	0	100	0	0	(100)	(100)	0	(900)
Net income	$ 20,900	$ 12,600	$ 14,400	$ 8,000	$ 15,200	$ 9,000	$ 11,400	$ (4,800)	$ 55,900	$ 30,800	$ 33,100
Basic earnings per share:
Income from continuing operations (in Dollars per share)	$ 0.71	$ 0.43	$ 0.49	$ 0.27	$ 0.51	$ 0.30	$ 0.39	$ (0.16)	$ 1.90	$ 1.04	$ 1.16
Loss from discontinued operations, net of tax (in Dollars per share)	0.00	0.00	0.00	0.00	0.01	0.00	0.00	0.00	(0.01)	0.00	(0.03)
Net income (in Dollars per share)	0.71	0.43	0.49	0.27	0.52	0.30	0.39	(0.16)	1.89	1.04	1.13
Diluted earnings per share:
Income from continuing operations (in Dollars per share)	0.70	0.43	0.48	0.27	0.51	0.30	0.38	(0.16)	1.88	1.03	1.15
Income (loss) from discontinued operations, net of tax (in Dollars per share)	0.00	(0.01)	0.00	0.00	0.00	0.00	0.00	0.00	0.00	0.00	(0.04)
Net income (in Dollars per share)	0.70	0.42	0.48	0.27	0.51	0.30	0.38	(0.16)	1.88	1.03	1.11
Dividends declared per share (in Dollars per share)	$ 0.1	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.09	$ 0.37	$ 0.36	$ 0.34
Weighted average shares outstanding:
Basic (in Shares)	29.5	29.5	29.5	29.6	29.6	29.6	29.5	29.4	29.5	29.5	29.2
Diluted (in Shares)	29.8	29.8	29.8	29.8	29.9	29.9	29.8	29.4	29.8	29.9	29.7
Maximum
Weighted average shares outstanding:
Common stock sales price (in Dollars per share)	$ 51.34	$ 38.92	$ 39.25	$ 35.84	$ 33.99	$ 31.53	$ 31.74	$ 32.83	$ 51.34	$ 33.99
Minimum
Weighted average shares outstanding:
Common stock sales price (in Dollars per share)	$ 36.64	$ 31.89	$ 34.22	$ 29.69	$ 27.02	$ 25.52	$ 27.83	$ 28.24	$ 36.64	$ 27.02