Derivatives Notional Amounts (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended |
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Mar. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Jun. 30, 2014 |
Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Foreign Exchange Forward [Member] | Minimum [Member] | Maximum [Member] |
| | | | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Not Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | Designated as Hedging Instrument [Member] | | |
| | | | | | | | EUR / AUD [Member] | EUR / AUD [Member] | EUR / AUD [Member] | EUR / CAD [Member] | EUR / CAD [Member] | EUR / DKK [Member] | EUR / DKK [Member] | AUD / EUR [Member] | AUD / EUR [Member] | | | | | | | | | | | | AUD / CAD [Member] | AUD / CAD [Member] | | | EUR / NOK [Member] | EUR / NOK [Member] | | | EUR / AUD [Member] | EUR / AUD [Member] | EUR / DKK [Member] | EUR / DKK [Member] | DKK / SEK [Member] | DKK / SEK [Member] | | | | | | | | | | | | | | | | | EUR / CAD [Member] | EUR / CAD [Member] | EUR / CHF [Member] | EUR / CHF [Member] | EUR / GBP [Member] | EUR / GBP [Member] | EUR / SEK [Member] | EUR / SEK [Member] | AUD / CAD [Member] | AUD / CAD [Member] | EUR / NZD [Member] | EUR / NZD [Member] | GBP / CHF [Member] | GBP / CHF [Member] | GBP / SEK [Member] | GBP / SEK [Member] | NOK / CHF [Member] | NOK / CHF [Member] | AUD / NZD [Member] | AUD / NZD [Member] | EUR / NOK [Member] | EUR / NOK [Member] | | |
Derivative [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Derivative, Percentage of Forcasted Transactions With Currency Rate Exposure | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 60.00% | 90.00% |
Notional Amount | ' | ' | ' | ' | $44,034,000 | $34,059,000 | $1,700,000 | $225,000 | $0 | ' | $2,039,000 | $38,000 | $0 | $68,000 | $5,470,000 | $2,142,000 | $0 | $5,589,000 | $0 | $2,599,000 | $0 | $19,157,000 | $14,867,000 | $0 | ' | $1,645,000 | $7,200,000 | $3,824,000 | $0 | $5,989,000 | $5,533,000 | $0 | $8,000 | $0 | $82,553,000 | $135,009,000 | $351,000 | $0 | $647,000 | $1,382,000 | $2,525,000 | $5,337,000 | $1,164,000 | $0 | $6,437,000 | $11,730,000 | $207,000 | $486,000 | $31,321,000 | $51,106,000 | $1,499,000 | $2,686,000 | $1,266,000 | $0 | $979,000 | $2,485,000 | $5,730,000 | $5,960,000 | $798,000 | $1,710,000 | $1,559,000 | $2,654,000 | $15,844,000 | $29,614,000 | $1,807,000 | $3,432,000 | $936,000 | $0 | $3,854,000 | $6,959,000 | $448,000 | $837,000 | $1,111,000 | $2,078,000 | $1,683,000 | $3,418,000 | $586,000 | $0 | $1,801,000 | $3,135,000 | ' | ' |
Unrealized Gain (Loss) | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | -668,000 | -781,000 | -20,000 | 0 | -1,000 | -5,000 | -89,000 | -94,000 | -63,000 | 0 | -129,000 | -66,000 | -1,000 | 4,000 | -5,000 | -168,000 | -59,000 | -45,000 | -25,000 | 0 | 37,000 | 58,000 | 191,000 | 102,000 | 15,000 | -1,000 | 13,000 | 1,000 | -643,000 | -501,000 | 88,000 | 75,000 | 1,000 | 0 | 232,000 | -111,000 | -21,000 | -26,000 | -103,000 | -101,000 | -66,000 | 31,000 | -7,000 | 0 | -13,000 | 66,000 | ' | ' |
Amount of Gain (Loss) Recognized in Income on Derivatives | 201,000 | 1,427,000 | -144,000 | 256,000 | -144,000 | 370,000 | -16,000 | -1,000 | 0 | 80,000 | ' | 1,000 | 0 | 0 | -3,000 | -81,000 | 0 | 28,000 | 0 | -43,000 | 0 | 14,000 | 250,000 | 0 | 35,000 | ' | -10,000 | -1,000 | 0 | 10,000 | -37,000 | 0 | 0 | 0 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Notional Amount of Derivatives, Matured During Period | $41,504,000 | $47,179,000 | $75,127,000 | $80,673,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |