Stock-Based Compensation - Stock option activity (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Options
Outstanding at beginning of period, Options	129		84	91
Granted, Options	4		45	1
Exercised, Options	(3)		0	(8)
Cancelled, Options	0		0	0
Forfeited, Options	(1)		0	0
Outstanding at end of period, Options	129	[1]	129	84
Weighted Average Exercise Price
Outstanding at beginning of period, Weighted Average Exercise Price	$ 216.62		$ 193.91	$ 193.13
Granted, Weighted Average Exercise Price	$ 258.37		$ 258.37	$ 258.37
Exercised, Weighted Average Exercise Price	$ 193.13		$ 0.00	$ 193.13
Cancelled, Weighted Average Exercise Price	$ 0.00		$ 0.00	$ 0.00
Forfeited, Weighted Average Exercise Price	$ 258.37		$ 0.00	$ 0.00
Outstanding at end of period, Weighted Average Exercise Price	$ 218.38	[1]	$ 216.62	$ 193.91
Stock option activity, additional disclosure
Options exercisable at end of period, Options	82	[2]	80	76
Options exercisable at end of period, Weighted Average Exercise Price	$ 192.96	[2]	$ 193.29	$ 193.13
Available for grant at end of period	11		15	12
Stock options outstanding, weighted average remaining contractual term	5 years 4 months 18 days
Exercisable stock options, weighted average remaining contractual term	3 years 8 months 6 days

[1] Stock options outstanding at December 31, 2013 have a weighted average remaining contractual term of 5.4 years.

[2] Exercisable stock options at December 31, 2013 have a weighted average remaining contractual term of 3.7 years.