Stock Compensation Plans - Summary of Changes in Options Outstanding (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of changes in options outstanding [Rollforward]
Number of Shares outstanding, Ending balance (in shares)	1,458,802
Number of Shares Exercisable, Ending balance (in shares)	834,737
Weighted Average Exercise Price, Options, Outstanding [Roll Forward]
Weighted Average Exercise Price outstanding, Ending balance (in dollars per share)	$ 26.99
Weighted Average Exercise Price Exercisable, Ending balance (in dollars per share)	$ 24.57
2006 Long-Term Incentive Plan [Member]
Summary of changes in options outstanding [Rollforward]
Number of Shares outstanding, Beginning balance (in shares)	883,109	1,189,012	1,389,598
Number of Shares outstanding, Exercised (in shares)	(349,551)	(297,528)	(170,998)
Number of Shares outstanding, Forfeited (in shares)	0	(3,125)	(20,087)
Number of Shares outstanding, Expired (in shares)	(49,224)	(5,250)	(9,501)
Number of Shares outstanding, Ending balance (in shares)	484,334	883,109	1,189,012
Number of Shares Exercisable, Ending balance (in shares)	484,334	781,574	885,003
Weighted Average Exercise Price, Options, Outstanding [Roll Forward]
Weighted Average Exercise Price outstanding, Beginning balance (in dollars per share)	$ 22.84	$ 22.91	$ 23.02
Weighted Average Exercise Price outstanding, Exercised (in dollars per share)	$ 25.25	$ 23.11	$ 24.04
Weighted Average Exercise Price outstanding, Forfeited (in dollars per share)	$ 0	$ 23.24	$ 20.48
Weighted Average Exercise Price outstanding, Expired (in dollars per share)	$ 29.84	$ 23.89	$ 23.64
Weighted Average Exercise Price outstanding, Ending balance (in dollars per share)	$ 20.39	$ 22.84	$ 22.91
Weighted Average Exercise Price Exercisable, Ending balance (in dollars per share)	$ 20.39	$ 22.79	$ 23.67
2010 Long-Term Incentive Plan [Member]
Summary of changes in options outstanding [Rollforward]
Number of Shares outstanding, Beginning balance (in shares)	750,296	356,050
Number of Shares outstanding, Granted (in shares)	268,300	417,420	379,425
Number of Shares outstanding, Exercised (in shares)	(26,113)	(567)	0
Number of Shares outstanding, Forfeited (in shares)	(18,015)	(22,107)	(23,375)
Number of Shares outstanding, Expired (in shares)	0	(500)	0
Number of Shares outstanding, Ending balance (in shares)	974,468	750,296	356,050
Number of Shares Exercisable, Ending balance (in shares)	350,403	117,219	0
Weighted Average Exercise Price, Options, Outstanding [Roll Forward]
Weighted Average Exercise Price outstanding, Beginning balance (in dollars per share)	$ 30.20	$ 30.66	$ 0
Weighted Average Exercise Price outstanding, Granted (in dollars per share)	$ 30.47	$ 29.80	$ 30.66
Weighted Average Exercise Price outstanding, Exercised (in dollars per share)	$ 30.36	$ 30.66	$ 0
Weighted Average Exercise Price outstanding, Forfeited (in dollars per share)	$ 30.16	$ 30.12	$ 30.66
Weighted Average Exercise Price outstanding, Expired (in dollars per share)	$ 0	$ 30.66	$ 0
Weighted Average Exercise Price outstanding, Ending balance (in dollars per share)	$ 30.27	$ 30.20	$ 30.66
Weighted Average Exercise Price Exercisable, Ending balance (in dollars per share)	$ 30.34	$ 30.66	$ 0