Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Summary of activities related to unrecognized tax benefits
Balance at the beginning of the period	$ 25,446,000	$ 21,906,000
Additions to tax positions related to the current year	0	4,507,000
Additions to tax positions related to prior years	248,000	126,000
Subtractions to tax positions related to prior years	(677,000)	(129,000)
Subtractions to tax positions related to settlements	0	0
Subtractions to tax positions as a result of the lapse of the statute of limitations	(882,000)	(964,000)
Balance at the end of the period	24,135,000	25,446,000
Unrecognized tax benefits that, if recognized, would reduce annual effective tax rate	22,500,000	$ 23,900,000
Unrecognized tax benefits, interest accrued	400,000
Unrecognized tax benefits, penalties accrued	0
Expected increase in unrecognized tax benefits during next fiscal year	$ 3,400,000